All fandoms are bad, but these are the absolute worst ones. My Top 10 Worst Fanbases:

1 Furries. From bestiality in the ancient past to the grown men putting on fursuits in the postmodern age, this is the absolute pinnacle of pure, unadulterated cringe that has built its way up throughout the course of human history. I dare not speak of the horrors drawn in the depths of the internet, lest you undergo psychological trauma from being unable to comprehend the true form of this fandom. The furry fandom in general transcends beyond cancer.

2 FNAF. I need not even explain how irredeemable this series, let alone its fanbase, is. This game reaches levels of cancer that shouldn't be possible. There's not even a hope of it slowly dying anytime soon either because its creator milks money out of sequels as much as he can. This is what separates it from Undertale.

3 Steven Universe. A cesspool of SJW's, ultra-progressives, and hyper-militant fangirls (case in point: the suicide thing).

4 Minions. There's a frikking Minions fanbase. Imagine the pure, unadulterated cancer of the Sonic fanbase during the 2000's and apply it now, and you have the cringy "art" and "OC's" for this "fandom".

5 Undertale. Generally horrible fanbase for a decent enough game. Full of bad memes now, and rabid fanboys of this are higher than for most other series. I need not mention that part of the fanbase, either. Also, on a personal note of mine, they tend to wank the heck out of characters like Sans, Omega Flowey, Asriel, and Chara to no end for vs. debates. Unlike FNAF, though, at least the creator hasn't succumbed to sequelitis and prolonged the cancerous fanbase even more. As we type these words, the fanbase is diminishing more and more as people leave for other series.

6 Homestuck. I can't see at all why people like this stuff. I've even steeled myself and tried to read some of it, but is just...bad. This fanbase is just one of those you usually tack on with the likes of FNAF and Undertale.

7 Bendy and the Ink Machine/Tattletail. As one of my best friends said, anything associated with FNAF or Undertale will have a bad fanbase.

8 "PC Master Race." Half of the time, I can't tell whether it's a joke or not, and that's the worst part of it. Obnoxious and quick to whip out their "superiority," they'll go on and on about graphics as if that's the only thing that makes a good game. If you put something 1080p in front of me, I'm not going to complain. I've even had someone I know say that "multi-platform master race" is wrong when I mentioned it, asking me what consoles had that PC's didn't. I mentioned exclusives and some games that don't work best with a mouse and keyboard (arcade fighters), and he went, "but mah emulators." Name me an emulator that can flawlessly run current-gen Xbox One/PS4/Switch games or even last-gen games, and I might reconsider it.

9 League of Legends. Overrated MOBA and a toxic fanbase beyond redemption. It doesn't help that people new to it will never be able to fully bridge the skill gap between them and the experts since they'll always be one step ahead, anyway.

10 Call of Duty. Full of screaming little kids in multiplayer saying they did your mom last night or people in Zombies beating you down for not sinking dozens of hours into memorizing the maps and stuff and taking it way too seriously. The series itself is overrated and regarded too highly by its playerbase, of course, but with the release of Infinite Warfare, CoD might pull itself together and be less of a cash cow. Competitive is a joke, too, since multiplayer is very luck-based regarding where you spawn, who gets killstreaks first, etc.

Honourable Mention 1. CS:GO. Yes, Gaben's baby isn't safe from this list. The game itself is, in my opinion, overrated and a generic FPS. Ragers, cheaters, etc. are pretty prolific. The people bagging on others for not spending $2k on a freaking knife skin are cancerous, and I personally don't like anything in the competitive scene.

Honourable Mention 2. Competitive Smash Bros Melee. There's a huge aura of negativity and disdain for people playing anything besides Melee (PM/Smash 4).

Honorable Mention 3. Overwatch. The fanbase itself is pretty bad with how massively successful the game has become, and they're quick to compare it to TF2. Also, it's like Blizzard is trying to force diversity down people's throats or something, and besides that, it even seems like a tacked-on afterthought or some characters' only defining trait. The game itself is fun, though.

Honourable Mention 4 (& Knuckles). Sonic. This fanbase's historic infamy alone gets it very close to this list, and it still has some of those crusty, nasty leftovers from the whole 2000's decade left over, although it's improving slowly now. From terrible recolored OC's to bad self-insert fanfics to abysmally horrifying art to the game series itself (which still remains mediocre), this series has had a very bad history.

Honourable Mention 5. MLP: FiM. If you had asked me in 2012 what the most cancerous fanbase was, it would have been MLP. However, I almost forgot completely about bronies altogether until some zoophile used some of my favorite songs in her bestiality pony games. The fanbase itself, as far as I know, has gotten a lot tamer and has stopped trying to spread it around like some sort of "animation gospel". Twilight Sparkle kind of reminds me of Patchouli Knowledge from Touhou in a superficial way, which is pretty cool, I guess. Eurobeat Odyssey did a couple of good songs for MLP, too, and his stuff is always good.