As gamers that like to spend a fair share of time on forums, we have all gone through this. We're always dealing with other peoples opinions as we try to be open minded about them. But we at least expect them to share that mindset when we disagree. Sometimes it's the "stop liking what I don't like argument" and I don't know a single person that doesn't find that annoying, so I guess that's number one.
(yeah... yeah... we shouldn't let things get to us. but I'm not perfect, and some stuff still does... so... yeah!)

-Stop liking what I don't like... too obvious what's wrong with this; I need no explanation.
-Brown games = bad... no they aren't! Stop saying this, and acting like you're so clever for noticing a game needs more primal colors!
-Innovation or burst... the game plays it safe. It's crap! Every game needs to be a new and beautiful experience that excites the senses and creates new ones... -_-
-Remakes = garbage... Dante is garbage because they turned him into a hipster looking dude. -_-
-Violence towards women in games = misogyny... NO IT DOESN'T! (unless it's torture porn) You're really being sexist if you think killing billions of bad dudes is ok and killing one bad female is wrong.
And finally here's one for movies I've gotten sick of.
-Lens flares = movies crap... THAT IS NOT TRUE! Sure lens flares might get annoying, but there's more to a movie than just technical annoyance like lens flares, slo mos, and shacky cams. You know? Pacing, story, plot and character development...?
(Yeah, those last two were sorta looking at you, Moviebob, with your H&G review).
(yeah... yeah... we shouldn't let things get to us. but I'm not perfect, and some stuff still does... so... yeah!)
-Stop liking what I don't like... too obvious what's wrong with this; I need no explanation.
-Brown games = bad... no they aren't! Stop saying this, and acting like you're so clever for noticing a game needs more primal colors!
-Innovation or burst... the game plays it safe. It's crap! Every game needs to be a new and beautiful experience that excites the senses and creates new ones... -_-
-Remakes = garbage... Dante is garbage because they turned him into a hipster looking dude. -_-
-Violence towards women in games = misogyny... NO IT DOESN'T! (unless it's torture porn) You're really being sexist if you think killing billions of bad dudes is ok and killing one bad female is wrong.
And finally here's one for movies I've gotten sick of.
-Lens flares = movies crap... THAT IS NOT TRUE! Sure lens flares might get annoying, but there's more to a movie than just technical annoyance like lens flares, slo mos, and shacky cams. You know? Pacing, story, plot and character development...?
(Yeah, those last two were sorta looking at you, Moviebob, with your H&G review).