I'm sure it's just them being really fucking assmad that the Vtuber community didn't fold at the slightest push, so they're trying to go after small fry who they think also won't fight back, only to find out that it's not working. It's pretty much the first real, unbroken resistance the troon brigade has gotten after trying to weasel into a hobby, and all it took was people saying "No, this is my hobby, fuck off".
The other parts are the absolute peak wiggerdom and polarization that constitutes zoomer online culture, fr fr no cap on jah, and the right-wing grifter types who unironically think having fun is degenerate.
"Shieeeeeeeeeet this nigga watchin' these cartoon bitches they look undreage muhfugga, shieeeeeeeeeeeeeet, muhfuggin pedophiles.", posted by a 16-ish white boy from an upper class family, living in an all white neighborhood in a 99% white town. People who get parasocial with their favorite fleshtuber and go on twitter and project about vtuber fans all being creeps, while in reality, they're assmad that their favorite twitch thot makes less money. And I think we've all interacted with enough of the third to know what they're like.