I was always told that one doesn't put one's elbows on the table because then everyone else is crowded out of their seats. I was also told that it is the epitome of bad manners to correct other people's manners in public and if the behavior didn't affect me pesonally I shouldn't get all offended looking. If soneone comes in wearing a hat, and it bothers me, I ignore it. I'm not being harmed by the hat. If the hat is a ten foot monstrosity at a concert and I can't see the stage, I move. I try to be tolerent of ignorant people. Life's easier like that.