Of course it's terrible to be called a slut, or be threatened with rape, assault, or murder. I wouldn't wish that on anyone. But it's pretty striking how what used to be a tried-and-true tactic of enforcing existing hierarchies—aggressive slurs and threatening violence—often tends to backfire spectacularly.
I'd add by the way that contrary to Jim's expectations Anita's video series actually turned out pretty well. The production values especially skyrocketed from the massive pile of outrage money she pulled down:
If anything, I'd say the video could have benefited from being more aggressively feminist. It's fun to watch people like Jim and his colleague Yahtzee Croshaw with really bold points of view, even if they go off the rails sometimes. Of course that's yet another set of tangled gender prejudices, but given that Anita is already in troll hell, she'd have little to lose.