I'm not personally associated (not a member on the boards) but I've seen a lot of discussions float my way over the years and if it became that way now it's unlikely to be from 4chan itself (or a community like it).
But your insinuation here gives credence to many that the internet is eating itself, when it's much more likely to be manipulation from those who stand to lose.
I say this as someone who frequented both communities at one time or another: they are very very very alike. I wouldn't be surprised if this who thing is a charade to take money from 'normies' as much a wall street.
I think that it's a bit of a stretch to say that the language they use means they're mocking people with disabilities or homophobia. Using words ironically just to be edgy is completely different from believing others to be inferior or an invasive entity to be defended against. That's very apparent when you talk to, say, an angsty teenager versus an actual ethnonationalist or even just your garden variety civic nationalist.
They might use the same words, but mean them in completely different ways, and actually be expressing very different things. I think that as it pertains to the internet, certain dialects of edgy, slang filled english are as close to a global lingua franca as can be considered possible. You can't paint all of these people with the same brush. Aside from speaking the same dialect of english, they use it to express very different thoughts, no less diverse or varied as those who speak other ones. This nuance will get missed if you overliteralize what they say and take it at face value.
Stop moving goal posts its a bad look.
The problem there is that the above people are already likely quite busy, and don't want to take on an additional (unpaid) burden by trying to clean up a sub they don't really care about.
That's one theory. Another would be that the gaining media attention caused an influx of users to join a group that equates itself to 4chan, causing moderation issues.