I have quite a few, but the only one I can think of at the moment is when someone gives me an obviously fake laugh to something that I said that wasn't meant to be funny. Just makes the situation really awkward to me. If what I say doesn't make you laugh, then you don't have to laugh.
Also bandwagoning drives me nuts. Like it's okay for a bunch of people to agree on the same thing because they all feel in their
own opinions that it is right. When someone just likes or agrees on something
solely becuase other people like it, then I feel a bit peeved.