'Nuff said. The only way this should still be a discussion is if there was any hint that Player B was angleshooting to get a read. And given the description in OP that doesn't even seem remotely possible.

Yeah, that tends to happen. When someone gets his way by being a jerk, he then loses respect for the other person for caving, which gives him license to continue being a jerk.

A similar kind of person is the guy who gets upset when he wins. He's so conditioned to lose and to feel relieve through complaining about losing, when he wins, he doesn't know what to do. You seem the players who angrily ask others why they called with a losing hand, it's the kind of thing. I had my moment of clarity when a player started complaining to me for giving him a big hand that got a lot of action and held up at showdown. Suddenly all his previous antics made sense.

Nice 1st post.

As a host, I allow the player who made an obvious mistake to retrieve his chips. It's a home game; it's a fun environment; it's a bunch of guys getting out of the house one night of the week (or month); it's okay if you're catching up with guys you hadn't seen in a few weeks.

Relevant rules already mentioned but just to me/in a home poker setting I think if it's an atmosphere where if the guy put in the wrong color chip on accident to make it a ~20x's raise would have been allowed to correct if a mistake the first caller before any other action certainly should be able to correct. If it's an atmosphere where that bet is staying no matter what I'm not a big fan of the next guy being able to take chips back if he makes a mistake (and again, the relevant rules have been mentioned just my opinion for home and/or private games).

Thanks for your thoughts!

As to the nature of the tournament: it is not a home game. It's commercial, but not run by a casino.

I talked to the staff about this the other day and they stated that, generally, chips that are put in the pot stay in the pot. However, they don't seem to totally agree on that among themselves, for one of them stated that under certain circumstances the chips can be taken back while the other guy disagreed...

Well, I kinda left it at that because I could see that they had their own issues of how such a situation should be resolved.

I also asked the dealer what he was thinking about the whole issue and he disagrees with the practice of forcing players who obviously made a one-time-mistake weren't allowed to correct that mistake when no action was caused and instead just given a warning.
Everybody knew that the player who bet the 800 was new to the game.
But he also stated that he didn't really forced his ruling because he knew that if he called for the floor, the floorman would rule the chips to be forfeited.

Well, again, one additional reason why it's a good thing to have RRoP laying around.

We play with this same rule and a few nights ago I was dealing and we had a player limp for 50 the next player raise to 200 (throws out 2 T100 chips) I announce raise, the button says raise to 1000 and throws out a T1000 (I also announce reraise 1000 straight) the limper (on his phone texting) says call pulls back his 50 and throws out a 500 chip (the smallest chip he had at the time). He knew he screwed up by not paying attention but Based on the house rule does he owe 200 or 500?

Generally I've seen this as the option to call the 1000, or sacrifice the 500.

Yes, this is open to angling. That's why it's a case by case basis. But I've seen this ruling multiple times in scenarios where forcing someone to call the full bet could also be justified by the rules.

Why do you want them to pay attention? It seems there is the built in and hidden penalty of not paying attention makes you play worse. I don't want rules to encourage my opponents to play better.