I know it's a little thing, but it annoys me when people take things you have said and try to make it their own. More of a pet peeve than something that inspires vitriol.
Here's a kind of lame, but pretty accurate, kind of "real world" example of what I mean:
Me: I don't know, this band is okay, but they sound too much like bands X, Y, and Z for me to really get behind it. I'm kind of tired of this sound.
thirty second gap in conversation...
Girl: Doesn't this sound like bands X, Y, and Z? I don't know if I like it because it sounds too much like those other bands.
Me: ...I know, I just said that exact same thing thirty seconds ago.
I mean I know imitation should be flattering, but just spouting out what I said feels forced and uninformed.