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,
the diehards continued to stan for Gaius, even if there were less of them in Ul'dah chat than there used to be, fortunately. The most Jokerfying experience there was mentioning the above plot points to a "beast tribe" genocide enjoyer in chat and being told "the story got stupid after a while so I stopped caring, lol." 
"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!)