Let's call Diss's posts "reams of hatred and bile" simply for the sake of argument.

I've never seen him target his "reams of hatred and bile" at parents simply because they are parents. Sure, he has plenty to say about bad parents, and how society allows bad parents to be much worse because their kids are effectively saddled with them, but that alone doesn't entitle him to the label of anti-parent. That would be like calling somebody anti-white because they supported Martin Luther King.