How do you handle this one? (Bad conduct and worse conduct)

[KipBond]

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I would also not open my mouth here unless I was in the pot. I usually let mistakes by others, including dealers, slide unless they are severe.

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Just wanted to reiterate what bav said. In this situation, you don't want to say anything during the hand, because you can only make things worse. However, after the hand is over is the perfect time for you (even though you weren't in the hand) to bring it up. Hopefully that will keep it from happening in the future, when it could be you in the hand that loses money because this guy shows his cards with others still left to act.

I was playing a hand once where a person NOT in the hand told a guy that was all-in pre-flop that he could turn his hand up (on the turn) since he was all in. That guy showing his QQ kept me from getting a lot more money out of my 76 with a 766Jx board against a 3rd player holding AJ. I somehow remained calm while letting the all-in guy & the not-in-the-hand guy know (after the hand) that it was not OK to show cards in a multi-way pot.