DISGUSTING.
Let me add another one - My biggest pet peeve, but it's actually a type of person is the man that is fake overly macho, like OVER THE TOP, fake-deep voice talking, mansplaining, coming to fix your gym-gear when you don't need him to do that, coming in your presence to give tips and his POV without you wanting it - JERK. I swear there is a woman version of this and this is the gossip-girl-aunt that cries if you are not married by 30 and tells you you will die alone and eaten by cats.
Another one - people who laugh at dumb comedies aka someone farting for 1,5 hours and this is a comedy... wow. I have relatives like that in my family and I have left the cinema multiple times, because I can't take the stupidity and farting and talking about excrements.