Most of us who've been involved with the fandom for any period of time have run into one or two REALLY obnoxious anime fans, gamers, cosplayers, etc.
Well this thread is for your horror stories and pet peeves.
Who are the most obnoxious otaku you've ever met IRL?
Ones you've met online?
What drives your crazy about other fans?
Have you ever been an "obnoxious otaku" yourself?