Fine, then show me where the other men have done anything about this.
Sadly, these men (fathers) were simply deceived - see the "Boiling Frog" / "Camel's Nose in the Tent" paradigms.
I understand, but the issue you're replying to has been going on for over five decades. That's far too long for men to fail to do something about it.
What's worse, it's a simple demand to make. If you don't allow boys to do it to girls, then don't allow girls to do it to boys. No one could argue with that, and the teachers who take it upon themselves to decide that one group of students must take whatever abuse (and that's what it is) the other group dishes out could be fired on legal grounds alone. Yet men can't even make a stand on that.
And I said men. If you want to reword it as some men, then show me where any group of fathers have done anything to change this.
Apart from that, a lot of what you posted makes sense. So here we are.
That's a very specific issue, and one I'm not really qualified to discuss.
(I had initially thought that you were addressing broader issues, like violence against women in all its forms, and that "bullying" was merely an example. With respect to the broader issue, I can do no more than simply say that it is wrong to villainize "men" collectively for the sins of a few.)
Re. your rebuttal that the aforementioned phenomenon ("bullying of schoolboys by schoolgirls") has been going on for decades: I can only repeat that I am not qualified to discuss this.
Re. my reference to "Boiling Frog" / "Camel's Nose": You forget that any given cohort of fathers probably only saw a narrow temporal window, during which time no significant change was observable. The shift occurred gradually - for any given cohort of fathers, no real change was perceptible. Every successive measure looked to them like a "baby step." And only when court cases made the headlines were fathers actually alerted to the extent of the problem (i.e., that school policies that may, on the surface, appear "innocent" were, in fact, being implemented with a heavy hand).
Regards,