Easily Nintendo fanboys. Their infinitely poor taste in gaming and unwillingness to bow down to Sony and all their properties shows ignorance beyond all measurable levels. Denial at its finest. 

A lot of PC gamers have that weird 'we're the glorious PC master race and you're dirty console peasants' mind-set, which can be annoying, they're definitely the second most annoying bunch of fans but Nintendo fans are just awful, they praise any turd Nintendo plops out and to be honest I don't like any of Nintendo's franchises/ consoles so it's irritating to see them troll Sony/ Microsoft who are great at what they do.

The ones that call other people fanboys because they criticized the company the fanboy is in fanboy-love with.

My preferred console is the PS3, most people know this just by looking at my sig, so when I criticize Sony in any way I receive no shit for it, but if I criticise Nintendo or Microsoft suddenly I'm a Sony fanboy to some people, those people that brand me a fanboy are the people I hate, because they're the one's who are fanboys, they get annoyingly defensive and feel personally insulted if you say anything negative about their company or system of choice.

All companies listed in the poll have these fanboys, and they're all equally annoying. Actually, Apple fanboys are the worst, I'm not sure why, but they piss me off the most.

Fanboys, period.

There should be a Sony/MS/Nintendo fanboys option.
Sony and MS fanboys because they support companies that are ruining gaming (and often oppose the company that isn't) and Nintendo fanboys because they don't troll Sony and Microsoft nearly vehemently enough, :P.

I also don't like those American Fanboys... (Red-Necks is the term, I think.)

Nintendo fans are some of the most unpleasable and critical of anything and everything the company does. Sure there are a few straight-cheerleaders here and there, but because of Nintendo's long history, it gained different fans at different times, all of whom have very different opinions on what "Nintendo" should be, and thus you get a very unpleasable group on the whole that are more often fighting amongst themselves than other fanboy camps

see also: Sean Malstrom.

Easy. The fanboy of the whatever you are not a fan of.

Fanmen.

Dude... Do you know how many times I've read some ridiculous cry-baby fanboy post here and then clicked on the profile of the poster to find out they're like 32! xD I really can't believe it sometimes, I hope they're lying about their age.

Which reminds me. I need to lie about my age.