I don't really have any. I kinda just ignore many of the small things that I find annoying for some reason or another, so I don't think about them.
Maybe behaviors of others that are there just to cause discomfort for others. I recall a time when going to pay for something, I asked if card was fine as I couldn't see a machine, and the dude said no with an angry tone. I stared down at him for such and he laughed and said he didn't like serious people in a mocking tone and pulled out the machine. Mind you, this was just after I came back from some hell, so my affect and demeanor would have been blank from such. So yeah, that'll be a pet peeve of mine. People should be nicer, I guess.