I hate fans who act like they're the first to do something.
Being an internet nerd who is very social on the internet but not really in rl, I tend to find out earlier than most ppl in my school about new kinds of music, books, or etc. I dont like to be the same as those bubbleheaded idiots who go with all the tiny trends and sing mainstream music everyday, so I usually say nothing of it cept to my best friend. So like when the twilight movie started getting popular, fangirls would be reading the books and acting like they're all that when I had read all 4 so long ago.. I, for some reason hated that. Same with the beiber mania (no im not obsessed with tht guy).