Then I look at my friends, and will not tell them, however kindly, that how they've been living for over 25, 30 years needs to change in some respects.
No, I suspect talking about the issue would really re-stabilise the relationship.
Because, since you said you don't mind sharing spaces with your friends, I'm assuming they do use female facilities.
And of course, it's not about using the facilities, it's about using the women in those facilities. It's the women who provide the validation. They are the resource. If they weren't there the space would be irrelevant. Their presence is the crucial part.
And that's one of the many reasons women disagree with it, in principle, nothing to do with surgery. Of course men have always felt they can use women for their own purposes, but this makes it much more stark.
And In terms of surgery, it doesn't appear to make much of a difference to the sense of entitlement, or male aggression.
There is, of course, the issue of predating on women, but for me, it's also about men's unthinking use of women as a tool.
Then, of course, in your specific situation, your focus is entirely on your friends.
You're not thinking much about the women. (except maybe you're wondering now, since you are asking!)
Women's biology means that their toilet provision serves far more purposes than the men's.
Women have to deal with menstruation and flooding, there's leaking when you're breastfeeding, morning sickness, miscarriages (many miscarriages happen on the toilet), etc.
Dealing with these particularly intimate issues is not something that most women want to do in the presence of men, whether they're secretly present or open about it.
These men should never have been given the idea that provision for women is something they can use as validation, therapy, disguise, call it what you like, in the first place.
And I totally understand how, if they have done it for 30 years, you would be reluctant to puncture their balloon. And there is a feeling that if transactivists hadn't fucked this up, men like your friends could carry on as normal.
But they'd still be using unconsenting women.