Most players leave me alone because I appear to know what i'm doing.

I don't care what anyone else at the table does with their cards.

The one thing I won't stand for is when some idiot who has no idea what the correct play is anyway gets on an inexperienced player for how they play.

At that point I look for a good time to split 10's or do something else to annoy the know it all.

(OK I also hate when a dealer explains about why insurance is a good bet when you have blackjack or a 20 and I've been known to speak up to a dealer for doing that)