All fanboys (and girls) are equally annoying!!! I am a Nintendo and Star Wars fan. And I know someone who doesn't share my fandom will find me annoying as hell.
But I think the most annoying of all are those that are so freaking cool that have no passion for anything in specific. Somehow they are pefectly balanced individuals that only care about the "important things in life" whatever those may be. To them everything is "just a game", "it's just a movie", "just a book".
These people feel that they can judge those who are pasionate about something and call them geeks, nerds, freaks, or whatever, and dismiss their passion as pure crazyness.
End rant.