First, allow me to admit to a bit of fanboyism towards Sony, Capcom and Valve. I like Sony because the Ps2 is possibly the best system I have ever played any game on and has enough great games to keep me occupied for years (added bonus: no Halo). Also, my PSP 3000 Has had none of the problems everyone complains about and has enough games to amuse me. Capcom has not released a bad game to date, to the best of my knowledge. Neither has Valve, even if some of their games are not my favorite genre.
Now as to which I find most annoying, Halo fanboys, probably because I am teh m4d suxxor at Halo. Seriously, I never break ten kills in online matches. Never. PS3 and FF fanboys are a close second though, mostly because of <url=http://www.youtube.com/watch?v=k-uTnqYHZ-I>this guy (WARNING: Do not follow the preceding link if you have heart conditions, a history of brain aneurysms, strokes or the IQ of a rotten tomato. This person nearly drove me to insanity since I didn't find it until he had turned comments off. GRRRRAAAAHHHHH!!!!). See? Fanboy hate is like someone hating all Muslims because of the extremists. They bother us as much as they bother you guys. Another close one is Microsoft fanboys, though they are less common then they used to be. I use Linux. I can't play all the fancy new shiny games you can. Stop rubbing my nose in it. I don't rub your nose in the fact that I'm wiping your hard drive for viruses for the fifth time this week, do I?
Oh wait, I guess I do. Well then let me do it properly: Windows can't block viruses for shit. I haven't gotten a virus since I switched to Linux, and I visit as many if not more porn sites than you do. What does that tell you?