I got banned from one of the largest Reddit subs for 'ableism' when I said, "People who are incapable of taking care of themselves should not have babies". No warnings, immediate permanent ban, no appeals.
I got banned from a FB group when I said something similar to a stupid bitch who couldn't figure out why her neighbours despised her, when she kept popping out intellectually impaired, severely behaviourally disturbed kids that screamed like they were being tortured whenever she deliberately put them into chaotic, overstimulating situations, which was often... if she were a neurotypical, she'd be the worst mother in the fucking world. Instead she is impaired to the extent that she can't even take care of herself, let alone multiple special needs kids, and pointing out that her out of control tardlets are destroying the lives of everyone within a five block radius is bullying.
I got banned from a LJ community years back, after telling someone to calm the fuck down, and that calling a cartoon pony "Derpy" wasn't a sign of impending death camps for disabled people all over the world.
I've been warned a few times here and there about "IT'S MA'AM!" bullshit, but haven't copped a permanent ban... yet.
There were probably a few other places, but that's going back a couple of decades and I suspect that those sites are many years deleted and forgotten by everyone, least of all myself.