1. You were in the right to ask
2. But don't be that guy who raises the tension level
3. You don't have to see his cards to know what he had

Show your hand, he mucks - he did not have a) 2 pair, b) a set, c) 76 d) AK, AQ or AJ.

What are you let with? AT or some one pair crap. If you need more detail than that, the game's too tough for you.

I have to make it clear that this is not a fish but quite good player. He doesnt play too often but i played a few times before with him and lost a few big pots to him. Neverbe able to see his hanfs is frustrating to me and make it difficult for me. I wouldnt normally enforce the rule but i wanted to see his hands when i had this oppotunity.

Not able to get information costed me money and will continue cost me. Why would i want to be nice to people and lose money to them?

People are trying to respond to both the etiquette question and your reasoning for wanting to see his cards. It is uncertain from the things you are saying that you'd be able to effectively counter his style with more than what he announced, thus the net positivity of requiring that information is under evaluation.

For instance, what? This isn't a strategy forum, but things like this make us wonder how much use you would get out of knowing whether he held T8 or AK.

So there you have it. You have decided that the value of seeing his cards outweighs being nice. IOW, info out weighed etiquette. That's fine. It's your money and your decision. But it doesnt change the fact that it is considered bad etiquette. It's not like saying "I wanted to know what hand he played with" removes the bad etiquette part. Everyone who asks to see a players cards after he declares a losing hand wants the same thing.

If you take him at his word that he has 8x, how much value does knowing his kicker and whether or not he was suited have for you? If you can't answer this question, perhaps you are just trying to justify acting out towards him because you are frustrated.

From his perspective, asking him to show may come across as not believing him, so you are questioning his honor and integrity. If you are among players who see poker as a gentleman's game, that will be seen as bad etiquette.

I have an 8.
How big?
Shows T8.
Oh, I thought you said an ace.
Table the AJ.

He ripped in 150 bigs with a junk hand in a situation where he should expect to get called a lot.

...................Fish.

If the rule and your atiquette conflict so much then something is wrong.

What you did was fair play. It is also generally considered bad (but not terrible) etiquette by most poker players in most cardrooms in most of the world. It can be both and not necessarily either or as you assert. It is a common situation that comes up pretty much every session.

The rules don't dictate that you verbally respond to your opponent when they announce their hand. Just stay silent and wait him out if you want to force him or her to show or muck. However, once you start talking you enter the realm outside the rules where table ethics and etiquette come into play and that is the cognitive dissonance you are experiencing here in this thread.

If I really want to see his cards, I usually just don’t say anything. If he persists, I’ll say something like “show em or throw em”, or “show or muck”.

It isn’t bad etiquette, but yeah I generally don’t bother because the information isn’t really worth pissing off a terrible player and the time it takes to show down the hand in this way.

The “get called a lot” part is extremely player dependent. Hero wouldn’t be the first player who folds for hours to an aggressive opponent before deciding to take a stand, only to abort that plan when realizing that means for all his chips. There’s a good chance villain put hero on some kind of strong but not premium hand and just misread his reaction to a shove. If I am villain and hero had been tight-passive all night, I wouldn’t think he’s going to call off with AJ.
You posted a question and got plenty of responses. What you should take away from this thread is that some players think what you did is perfectly fine while others think it’s a (minor) breach of etiquette. How to use that knowledge in the future is up to you. But you certainly won’t convince someone at the table that their “bad etiquette” thinking is wrong.

Why? Rules and etiquette are not the same and need not be in agreement.

Opponent dependent. Standard play is to just turn your cards over as soon as you are confident you are good (as you should be once he announces an inferior hand).

However if you intentionally slowroll me or insist on seeing my hand when the situation is reversed and you have the goods then I’m forever waiting for you to show first.

This is a good way of looking at it - particularly in games with small player pools where you are going to run into the same people frequently

If I was at the table, I wouldn't expect to see hero roll AJ but I also think villain relying on significant fold equity from a player who just lrr for 1/3 of their stack is a fish move. Not to mention then fishily berating him when a pro would mentally shrug and move on. Dude doesn't sound like the uncrowned king of 1/2 to me.

No, it is what it is. I can snicker every time you lose a pot at the table and do a little dance in my chair every time I win a pot at the table, there is no rule against it. It's poor etiquette though.

To reiterate something I've said before...being a rules nit is rarely +EV

+1

It is not because villian was last aggressor. That action crosses streets because someone is all in. The last action was the last action possibl. Very subtle difference but one that matterss

Grunching a bit but yes you were in the right. What you want to consider, though, is what you gain or lose here. Is the info worth upsetting someone who spews? Is tilting him going to make him spew more or leave?

If you want to needle, ask him what his kicker is (as if it plays here) and then show the ace. Personally I would massage this guy's shoulders and feed him grapes to keep him at the table happy and spewing.

You somewhat contradict yourself.

You say he's loose, reraising the straddle all the time. You've made a very clear read that you use when you limp reraise to $100. He jams, and you call.

Then you say you need to see his cards. When a guy jams, and the board has an A8xxx and villain says he has an 8, you can rest assured that your read that you used to get all in with, was right.

Sure its within rules to see his cards, but you forcing him to show doesn't allow him to save face. This is a social thing and maybe he can tell the table had actually had QQ and got really unlucky that you sucked out and hit an ace. Instead you made him look silly.

Not identical to the OP post, but related. A few weeks ago a guy who I know tends to bluff a lot, shoves all in on a very dry board. I called with AJ, but no pair, just A high. The villain says "Good call, it's yours" but doesn't toss in his cards or show them. Is his declaration that I've won the hand binding? I think he might have bottom pair and is hoping I'll show something like what I've got, A high. I think he's angle shooting. Opinions?

Not generally, though we have seen posts about some rooms which do rule that concession binding. I personally think that's a bad rule though.

Just smile and nod and hold your cards like you're ready to discard them as soon as he does and hope for the best.

Unless you know that this room has a house rule that says it’s binding, I wouldn’t assume it is. When in doubt, always err on the side of safety.

There have been no confirmations that I've seen, but suggestions that the Bellagio was enforcing all verbalized 'concessions/surrenders' at Showdown due to a high volume of slow rolls and information seekers mixed into their regs.

As with a 'tossed' but unmucked holding, just sit there and wait for them to muck or show ... or until the Dealer steps in. GL