I generally hate the following:
Modern Military Shooters: one's okay, two's fine, but we're up to... how many, now? Why is there a consistent need for more? Why not release a *single* Modern Warfare or Battlefield title and patch it regularly? You'd buy the maps you like, the weapons you'd like, and occasionally stay on your toes for a massive mandatory update that changes the engine up a notch. All of it micro-transactioned. Why not? It'd make for this much less useless CD or DVD sleevage on the market.
Boxing Games: they tend to control like ass, and I don't get the sport's virtual appeal. Watching a boxing match is cool, yeah, but if you want to beat the crap out of someone for the heck of it, why not play Mortal Kombat?
Writers who ride on the Potter-slash-Twilight craze with piss-poor knockoffs: granted, Twilight is a piss-poor knockoff of itself, so... Yeah. I just don't get it. The Southern Vampire Mysteries looked like a worthy successor to the Vampire Chronicles, but all social commentary goes out the window as soon as the books start to focus on Sookie and Bill's respective love lives - which are fucked up as all Hell. The TV series replicates the same exact problems.
Don't get me started on The Vampire Diaries, The Little Vampire and other crap like that.
Horror franchises that go for the camp or the smart-aleck routine: I love the first Nightmare on Elm Street, and the recent remake does a passable job at returning Freddy to a darker, more threatening source. The first Freddy sequels, though? Poor Robert Englund. Poor, poor Wes Craven, too.
People who call themselves bookworms because they've downed the Potter or Twilight series, and nothing else: um. No. A true bookworm has withdrawal symptoms if he doesn't have one five-hundred page brick per week to seek his teeth into.
Academics who piss on popular culture: the last thing I'd like to become is this, an elitist asshole who ignores anything that isn't written by the latest recipient of the Man Booker Prize, the Goncourt or some book convention. Modern literary studies are working really, really hard at debunking the perception that popular culture is absolute drivel, but you'll still find blowhards who curl up their nose if you state you haven't finished reading the Illiad.
Idiots who persist in trying to fuel the console wars or the "casual VS pro" debates: for God's sake, a game is a game is a game is a motherfucking GAME. I don't give a shit if it has a simpler ruleset than chess or if it's one of the yearly hi-def killfests with a ladder and a competitive scene - if it's a game, it provides enjoyment. Everything else can go straight to Hell. This puts Gears of War on the same footing as Parcheesi, yes, but are both products really all that different? When you play them with other people, there's a winner and there's three or more losers. If you're not a twat, you'll GG the other players and offer a rematch.
Idiots who persist in defining themselves as "hardcore": no. Hardcore people create. They invent, they revolutionize a given field, they change the way we live our lives. You with your insane kill-death ratio in Modern Warfare 2 are NOT a person who deserves praise or song. Leonardo Da Vinci deserves praise. Marie Curie deserves praise. Games can make us feel pretty good about ourselves, but saying you "pwn n00bs" on your resume will not get you ANYWHERE in life - even if you're applying for a game developer.
Sore Losers Online: stop cussing, stop threatening me, and decide whether or not you're leaving the lobby. You lost a match in a game. That's all. You weren't butt-fucked by rabid monkeys or drugged and bereft of one of your kidneys. Get over it.
Hypocrites in general: especially hypocrisy in the news. Don't act like you're a candidate for sainthood when we both know you're not as white as the driven snow.
Trolls: just... Why? Is your life so meaningless and empty of gusto that the only way you can derive a sense of achievement is by spoiling a thread for everyone else involved? If so, why are you so dense? Not that I'm referring to the more heinous forms of trolling out there, not tongue-in-cheek jokes like those you'll typically find here. I'm referring to grade-A assholes, not to the fine folks here who occasionally post image macros and such.
Y'know... 4Chan-level trolling. "For the lulz" just fails to explain it, past a certain point. It feels more like some kind of sick desperation.
People who post dupes on torrent trackers and who aren't affiliated to publishers, developers or record labels: again, why? I need "The Remains of the Day" for an assignment and I can't be arsed to go looking for it across town at the local art-house video store - and you stick me with Swedish porn instead?!
I mean, free porn is cool and all, but there's a time and a place for all things. I was looking for Anthony Hopkins and Emma Watson sharing a complex and constipated quasi-romantic relationship, and instead I got five busty blondes and three massively hairy dudes doing what-what in the butt to the tune of an EXTREMELY Blaxploitation-ish soundtrack.
Um, thanks, the girls look cool and all, but no. Not in the mood for a boner.
Virus designers in general: don't tell me most of them work for a government or a given corporation, because it's mostly the hoi polloi that get shafted by things like Melissa. What, are some coders so horribly bored that the only way they can find to entertain themselves and their genius brains is to put a few hundred thousand sheeple in the throes of digital agony? Is the human race really so retarded as to produce people like that?