There are only really two types of Otaku that I absolutely cannot stand.
Type 1: Narutards, Because they have it in their head that Naruto is the End-All Be-all of Anime, they think its the best in every way and not flawed in the bit. They irritate me to no end because they don't realize that the show is Ass Pull after Ass Pull (Oh no I'm going to die, OH NO WAIT SPECIAL MOVE I JUST MADE UP! Oh yay Bad guy is going to die, OH NO WAIT I GUESS HE IS SUDDENLY IMMORTAL NOW WTF.)
Type 2: Sub-[Top Spin]s, Those guys who hate Dubs and prefer Subs over everything else, complain about dubs when they have no intention on watching them, and complain about dubbing in general, EVEN THOUGH THEY HAVE THE OPTION TO WATCH WITH SUBTITLES. They complain about everything when "This actor sounds dead compared to this Seiyuu" or "This line lost all meaning because this actor sucks [parasitic bomb], I like the Seiyuu better, Wah wah wah." If you don't watch dubs, don't [sonic slicer] about people liking dubs. Don't say they aren't true fans because they don't watch the anime in Japanese only. Don't say they aren't true anime fans if they enjoy Dubs.