I have quite a few, ...but RPF hates it when I bitch, so I'll limit the list, ...for now.
1) Arrogant pricks with a God complex who get annoyed at other people's preferences or interests.
So something doesn't interest you? Who gives a poop... ignore it!
2) Losers with no life of their own, ...so they stick to your tush like a too tight thong,
...or chewing gum stuck to the bottom of your shoe on a hot day.
3) People who blow their noses at the dinner table or in restaurants. They need to excuse themselves.
4) Racist bigots, and those who tolerate them. I just love watching the khannip-fit they experience when after ignoring racism for so long, they experience a little taste of it, ...and can't deal. (Not quite sure if that's a pet peeve, ...or a guilty pleasure)

5) Liars
6) Sycophants
7) Egotistical people
8 ) Mentally weak cowards who run away from dealing with or confronting issues head on,
...as if ignoring an issue will make it go away.