There's a lot of straw-manning going on here. Posters claiming in faux outrage that people who want the rule observed that boys over 8 don't go in the ladies', are saying 'send them into the men's'. We're not. We're saying keep them out of the ladies.
There is a wider social issue reflected here, which I find interesting. The recognition and willingness to talk about the fact that some adult men are sexual predators, violent or threatening in other ways, and we cannot know which ones they are.
There is an interesting reflexive response by some, many, too many people of 'oh well, everyone who feels worried or vulnerable can bundle into the ladies', it's nice and safe in there'. So with trans-women and the gender non-binary people in, well everything that's sex-segregated, so with boys at swimming pools. Thus destroying the very place in which they sought refuge and turning it into a unisex 'everyone except some men', while also removing the ability to challenge any man or boy who wishes to enter, whatever his motivation.
Women and girls, including pubescent and teenage girls, as the universal mother figure; soft, kind, caring, welcoming. Women and girls as the universal solvent for everyone's fears and problems. Truly we are all the mother goddess .
There is a real and burning issue, about male violence and male sexual predation, that needs to be named, faced and tackled - predominantly by men. It is still after all, predominantly men who are in power in this society.
Let's not take our eyes off the ball. The problem is predatory and violent men. They are the problem that requires a solution. If your son's fathers are decent people, they can see that and the need to campaign for real, meaningful change too. So that their sons and daughters can go about their lives safely, in comfort and with dignity.
What are the decent men doing about this problem with bad men?