Ooh, the weirdest goes to Helldivers 2's fanbase without a doubt. It's so fucking toxic. But I say weird and not mean because they're the friendliest bunch around as long as you don't make your opinion of the game's balance clear. But once you do... the fandom is split into two halves, and they fucking hate each other. So as to not take sides I'll explain each side from the other's view point:

On one side you have the "cry-divers", who complain about literally everything the devs do. They bitch and moan all day long about balance and how the devs' vision for the game isn't the same as theirs. The devs could give them everything they wanted but also include a tiny little nerf, and the only thing you'd hear from them is endless crying about how PvE games should never have nerfs.

On the other side, you have the "glaze-divers". They will defend the devs no matter what they do. Devs just nerfed the weakest gun in the game? Devs just blatantly lied to their community in their patch notes? Devs just shot your dog? Call the glaze divers.

Now obviously its more nuanced than this. But they sure don't know this. It's gotten so bad that someone in the first camp offered the devs an innocent challenge to demonstrate the poor balance of the game. And then someone (multiple people?) in the latter camp doxxed them, and then got them kicked out of the place they volunteer at for safety reasons because they got sent too many death threats. They might have gotten fired from their job too, but I don't remember. It's wild.