I don't think that's quite what's happening, I think the phenomenon in question is occurring primarily within a specific age group, and I think it doesn't correlate with porn availability or consumption.

If X predates A by a long time then any attribution of A to X is going to need extensive evidence.

I think the phenomenon you refer to has to do with politics and culture. It's loosely related to the pendulum swinging back against DEI type stuff. Depending on your political persuasion you might replace "bitter misogynists" with something like "angry cynics".