Hypothesis for the escalation: dominance contest enacted through increasing hostility. Each comment must escalate from previous misogynistic comments, because if the new is not more extreme than the average, how can the writer imagine he has made an impression?

I think that a lot of male anger towards women is down to an inaccurate perception of a power imbalance against them. Most of them are het. They want womens bodies, because a) inclination and b) they've been told womens bodies are nice. They've been taught their own bodies are repulsive. Result, they believe that sexual relationships are inherently imbalanced against them.
If that's true, one implication would be that most men are also a) bad at logic (or they'd see the flaws there), b) bad at understanding their own emotions (or they'd realise they're angry and try to work out why), and c) slightly out of control. A disturbing thought to me, but it all seems to fit. Then again, I do have a predisposition to accept depressing theories.

Of course, there are alternative hypothesis available. Perhaps a link to the video has been put on some unpleasant male supremacy site, or something?

Either way, if it were me, I think I'd just remove the video.