I don't have any huge important ones, but just a couple pet peeves:
Cologne/perfume: Most of them smell like rubbing alcohol and hairspray to me, especially when people just douse themselves in it. It's supposed to be subtle, not fill a whole room! When I was a child and my senses were keener, I had to hold my breath walking past Bath and Bodyworks. I've grown to like some scents, though.
Dirty public toilet seats: I understand when you flush some toilets it can spit some water out, but I don't understand when people don't clean up what is obviously their piss and pubes.
Stop hovering and use a seat cover!
Forks scraping on your teeth: I hate the sound and when I accidentally do it I get the shivers. I hate how sound artists in the movies go overboard adding this noise, too.
Cigarette smell gives me headaches. If I'm around it long enough, it makes me nauseous, too. I don't look down on people for smoking but do it outside, please.