I don't just mean Heated G!mer Words. 
Those are a given. I mean a specific community with its own quirks, idioms, or other ways of being terrible.
Mine comes from FFXIV. @[email protected] can probably back me up on this one: diehard genocide enjoying 2.x Gaius Van Baelsar stans.
The character was retconned a little especially after he was officially said to have survived the 2.0 finale, and had been up to some very sus shit in the background like raising child soldiers that had extremely sus feelings written into the side story narratives about their senpai 
, but the original A Realm Reborn Gaius had an entire cryptofascist fan following that was really into his "The Garleans are good actually and they are enlightened atheist luminaries trying to kill all the superstitious beast tribe barbarians in the name of LE SCIENCE and are SAVING THE WORLD against the evil Primals" takes.
Even when later expansions revealed (obvious spoiler alert)
spoiler
that the Garlean genocide campaign against the "beast tribes" was deliberately engineered to encourage more Primal summoning as both a casus belli tactic to invade other nations and also as a means to further the interests of the Primal-summoning Ascians that founded and effectively ruled the Garlean Empire all along, making all the genocide enjoyers look very fucking ignorant after that reveal,
Honestly?
Telltale fans because they defend games that legitimately suck (okay, fine, this is more of an opinion and I don't really "revile them" per se) to the point where you'd think they were better than they were, especially after the first part of Telltale's The Walking Dead (which is the only "good story" of theirs, but still barely had any alternative paths or branching decisions).
Though the recent The Expanse video game seems interesting and seems to have actual gameplay so that's neat. Maybe the decisions will actually matter... Oh yeah, and I think there's a recent Star Trek one as well.
Oh yeah, and Dark Souls fans just for the "git gud" meme alone.
Otherwise, I can't think of anyone specific if you want that.
I'll say this: the Tali fandom from Mass Effect on the old BSN forums were, other, pretty crazy (and it's not like I hate Tali given that I barely played the Mass Effect trilogy). But yeah, they had a... reputation. You said one bad thing about Tali and it was your neck on the line, or that's how it felt like, and the witch-hunt seemed to carry to other parts of the forum...
It's not quite
but that kind of reminds me of the really obnoxious side of the Doctor Who fandom that can not shut the fuck up about "who is best companion" and rate them in increasingly horny or shippy ways on tier lists and get downright feral if their thirsty shit is called out.
Yeah, it's not just g*mers that do it, but yeah, and I'll just say that some gaming fandoms are worse than others.
One of the most obnoxious uses of false equivalency on the internet is the "every fandom has good and bad people in it therefore all fandoms are equally good and bad, you can't criticize specific fandom" takes.
I don't think stamp collectors have an equal chance of Heated G!mer Moments as
do, for example.
Yeah, I agree.
Like, once upon a time, the Sonic fandom was indeed pretty toxic, though it's gotten better over time.
There are differences... and then there are degrees as well.
Let's not act like we're not seeing "quality" in action.
"Historically Accurate"
slashy stabby choppy medieval killyman game fandoms tend to be a lot more toxic than other game fandoms. Just the chat/lobby text alone is often repulsive enough for me to not stick around.
You know what's "historically accurate" as well?
HOI4 fans being... problematic and not just in the typical "toxic" way but in the fascistic way too, tbh... (but still toxic as well!)