If for example on a 2/5 live game, somehow the pot was 300$, the board is KQT9K your opponnent checks, you make a bet 1200$ with J8 and he calls. You open your cards, your opponent show his cards to his neighbourand throws them in the muck face down, it touches the other cards. Then after 2 seconds he picks them back up and flips them. He has J8. There's a second of shock, and the dealer proceeds to split the pot. Would you feel bad calling the floor and insisting it's a fold ?

no

It happened to me like that and I was not comfortable to complain. But then I thought again and thought it would have been ok because it's part of the game.

Whether or not you would be ok with a chopped pot shouldn't be relevant. There should be a rule that covers every eventuality. Don't listen to anyone who criticises you for insisting the rules are applied. As the cards touch the other cards when the opponent initially folds the hand is considered folded and the pot cannot be awarded to/split with the opponent irrespective of the wishes of the players. This is the rule regarding this eventuality in the casinos I play in.

There is no magic muck.

There are a few casinos that still honor the Magic Muck.... but only a few. Otherwise if the cards can easily be retrieved, they are still live.

OP, if you plan to play at this particular casino often... find out from the floor the next time you visit.

As said above, it depends on the rule at your casino. Where I play, this would be a fold by the other player. I would usually call the supervisor to get the dealer decision revoked. I would usually not call the supervisor in a $20 pot because I'd rather get on with my life but if the other player or the dealer had irritated me, yes I would call the supervisor just on general principle.

In other casinos, it's not a fold. House rules matter.

Enforcing the rules is generally not considered a breach of poker ethics. It might be considered being pedantic or a breach of personal ethics depending on the circumstances. Enforcing the rules in this situation is fine, if it's actually a fold. Checking the rules is also fine. I might call the floor in your situation and explain why I'm doing it "I want to check that's right, where I'm from that's a fold". Understand though you're holding the game up and it may cause bad feeling.

It isn't a fold...the player called and cannot fold facing no action.

So the only question is 'Are his cards dead?' In most rooms, any cards that are 100% identifiable are still considered live, even if they touch the muck. The hand, as you describe, seems to have been handle correctly unless the room you are playing in is one of the few 'magic muck' rooms left (so named because the muck has the magic power to kill hands with simple contact).

As others have advised, ask a floor if identifiable cards are live at showdown, even if they graze the muck. Most likely they are.

If he hadn't shown his neighbor I would be fine with chopping.

I’m not calling the floor here. The cards were identifiable and should be live. A fair game is more important than winning any single pot on a technicality because a room has bad rules.

I think it’s wrong to try to win the whole pot here even if his hand is dead by the house rules, but to each their own.

Overbetting 4x pot with just Jx here seems kind of insane btw, unless you’re specifically ranging him on Jx and trying to get him to fold a chop.

Not a huge fan of the river sizing either

Not a muck in most rooms anymore. Cards that are still identifiable are still live .. but don't get cute and count on this ruling like this guy may have. Most Dealers would've smashed them into the muck pile before he could've reached back towards them.

Pretty gutsy bet into that Board to gain 'only' $150 ... are you really going to generate 7 folds for every time V has AJ or FH? Bet what you want, but I'm thinking that there's a bet size that is basically 'the same' as any other larger bet, so don't waste those chips by putting them unnecessarily into the middle. GL

Breaking away from this specific hand, which would be live in most rooms anyways, the general question is 'Are you OK with having a winning hand killed with a technicality, when the integrity of the game is not threatened by overlooking the technicality?'

For example, a player fumbles his cards, one drops briefly in his lap, and then he picks it up and tables the winner. Dealer looks over at you questioningly. You know the player and have no concern about cheating. Are you OK asking the dealer to killi the hand or do you just say 'it's fine' and discard your hand.