

Not a good example. “Defending X” is a much stronger requirement than just “pointing out that a specific argument against X is invalid”; the latter is done by everyone who likes seeing good arguments rather than bad arguments, and isn’t a sign of liking X.
(The most pro-russian (as in, supporting the russian-ukraine war) stuff I’ve seen was various memes from lemmy.ml and lemmygrad that ended up in popular. I’m having trouble finding a better example than that; in particular, because Lemmy’s search is bad and doesn’t seem to allow for searching recent comments from a specific instance, and also refuses to give me more than a few pages of results.)
The incidence of intellectual disability among autistic people is notably higher than among non-autistic people, and similarly for the incidence of many other comorbidities.
That said, I’m not sure what you’re trying to argue for, here. If you’re trying to say that we should be more accepting of neuroatypical people, like those with autism, I agree; it has improved quite a lot in the last decade but it’s still not great. If you’re trying to say autism shouldn’t be considered a disease and there shouldn’t be efforts to find a cure for it, I don’t agree.
I’m not sure why antivaxxers focus so much on specifically autism as a supposed vaccine sideffect. I think it might be historical reasons (it dates all the way back to Fudenberg and maybe even older), plus the fact that it’s a mental problem rather than physical and hence trivial to motivatedly “self-diagnose” (it’s much easier to claim that after you vaccinated your child you immediately noticed “clear autism symptoms”, than to claim their leg abruptly fell off).