Oh, I have a really good list here:
1. Most of Sonic fanbase. FULL of crappy recolors and over obsessive fan girls. I knew someone who did recolors and was obsessed with Tails...ughh! >.< But other than those things, it's...meh.
2. Some of the MLP fanbase. OK, I am a pegasister, and proud of it. But I hate how people say "love and tolerate" when some people forget to follow that rule. What bugs me the most is that most of the fanbase hates on the older generations of MLP. I love G1, G3, and G4 ponies, and it really gets on my nerves when I see a comment like "G3. AHHHH MY EYES"
People forget that the creator of the show originally intended some of the G1 ponies to be the original mane 6, but due to copyright reasons, she couldn't do it. The only G1 pony she was allowed to use was Applejack. For example, Twilight Sparkle is apparently the daughter of the G1 pony, Twilight. Fluttershy is Posey, but with wings. Rainbow Dash is Firefly, but with G3's colors. Not so sure about Rarity...Pinkie Pie is Surprise, but with G3's colors and has no wings. My mom still has her G1 Surprise, and when I told her that G4 Pinkie pie was supposed to be Surprise, my mother fell in love with Pinkie! True story.
3. Original Pokemon series fanbase. Only ones who whine about the new voice actors, Pokemon, stuff like that. My cousin is a G1 whiner. sure everyone has their own opinions...but people fail to realize that 4Kids is a horrible dubbing company, and the original Pokemon anime was horribly mutilated with replacement foods, cut scenes, weird voices. The only voice that I like that was dubbed by 4kids is Ash's voice. And I've heard the Tpci's dub, and I haven't gone deaf. Plus, in the new ones they don't cut out stuff as much as 4Kids did.