People driving slow in the fast lane, from granny to truck drivers.
People that are loud or fucking with their phones in movie theaters. I've nearly gotten into fights because of assholes with no movie theater etiquette. Anyway, I don't go to theaters anymore. I let shit escalate until it's ruined for everyone.
Super petty: when people confuse "lose" and "loose" and their variants (loser, looser, etc). That particular mixup makes me stop for a second every time I see it unlike other spelling/grammar mistakes that I see. I'm not a grammar nazi, nor do I call anyone out on it because it's so common, it just makes me stumble when I'm reading for some reason.
Chanel: There's a lady at work that wears this, and I only know that's what it is because she wears a lot of it and one of my co-geeks at work knows for sure that that's the scent. The shit doesn't smell like perfume to me, it smells like some sort of industrial strength hospital sanitizer... like that's what those little red biohazard trashcans at the Dr's office should smell like. I shit you not, you can track this woman down in the labyrinth of my office just be smelling. Shit gives me knife-like headaches.
People telling other people they need to "work on their style" in reference to skateboarding. That's just stupid... you don't force style, style is something that you just have, whether it's sketchy or buttery.
People at red lights that stop two car lengths away from the car in front of them (not counting people that stop to prevent blocking parking lot/drive through entrances). Whenever someone in the other lane does that, I try to get my car in front of it even if I don't need to be in that lane, fucking assholes.