It's got nothing to do with a general postion against masturbation nor the sexual revolution — TheWillowOfDarkness

But it does, because that's the context in which he made the statement. As I guessed, he is broadly against masturbation in general for ultimately sexually conservative reasons which most of us disagree with, but it's not sexist if he is applying his judgments to both men and women equally (the quote we read was him addressing female masturbation during coitus, but there's additional context surrounding it that doesn't make it seem like he is singling women for special mistreatment.

If you don't care about context, then you don't care about what he actually meant, and if you cal him sexist on the grounds of "how you feel about what he said" instead of "what he actually said and meant", then you're just helping to make the charge of sexism incoherent.

There's a new interpretation of how hate crimes can occur that has recently come onto the books of a few nations (U.K to name one). Instead of having to prove the guilty mind of the offender, what instead must be established is the wounded mind of the victim. Under the new line of thinking, if someone says something which could possibly be interpreted as racist or sexist or targeting any specific protected group, and someone is emotionally upset by it, then by definition they have committed a sort of hate crime.

"Count Dankula" was convicted of a hate crime because he taught his girlfriend's pug to sieg-heil on command, and uploaded a video of it to Youtube. He thought it was a hilarious prank that could not possibly hurt anyone, but eventually the right people complained to the right people, and he was convicted by a hair on the basis that he was being intentionally "grossly offensive", where the comedy defense was outright rejected.

Why do I see a sexual conservative where you see a sexist? What does howling at him as sexist actually achieve? Might it get him further "de-platformed"? Are you hoping to sway hearts and minds?

If I were to criticize him on the basis of being foolishly sexually repressive, especially as it concerns masturbation (for all genders), and make practical arguments as to why his advice is to restrictive for contemporary society, do you think I would persuade more people (or even him) than if I just started calling him sexist and focused only on the ways in which his beliefs are detrimental to women?

Sure, you get to add the #Feminism to go viral on social media, but my way actually seems to yield moral and intellectual progress (as opposed to righteous feudalism).