Regular FWR but have NCed for this post as don’t like linking anything RL no matter how small/tenuous. Also a little behind on discussions as brain is slow.
just a point re the toilets issue that was being discussed earlier, as it’s not something that would usually cross peoples minds (and one aspect may be a useful discussion point with your DS
as a “how wouldyou feel comfortable handling this as a man?”)
recently I am finding (possibly as an own goal due to raised awareness, even women stickering perhaps, who can say? 
) that local places, have started making changes and just having “mixed gender” 
toilets i.e. closed floor to ceiling cubicles, and letting either sex use them. Similar to disabled toilets, so with a sink in the cubicle, but inward opening doors lockable from the inside. In theory it sounds good, but as a female (uncontrolled) epileptic, an absolute nightmare. For some reason I seem to be fond of having seizures in bathrooms I don’t feel comfortable not locking the door for obvious reasons. inward opening doors make retrieving me a nightmare as I’m usually blocking it. floor to ceiling walls mean I can’t easily be checked on. So we are (admittedly a very small) demographic who they aren’t suitable for. disabled toilets have the same closed room issue but are easier to access as doors usually open outwards and radar key operated from outside.
Re “normal” toilets, the part that may be useful for you @jazzycontemperaneousnotes
is that I have to always have someone with me atm in public places. If I go into a women’s toilet, DH will wait outside for me, and hope I come back out basically! if I don’t, DH has to check - either finding a female member of staff to do so, or more usually, doing it himself. Example of a motorway service station with zero staff about apart from ones who can’t leave tills etc but will “radio a manager” and nothing happens - so meanwhile DH would have to open the main changing room door and announce (“man here” style, poor DH
) that he needs to come in to check his wife with epilepsy and give 30 seconds or so for any objections/women to leave. He then would have to knock all occupied/locked cubicles and if one has no reply (or he can see part of me at the bottom) try and look down on me from the neighbouring cubicle to see if there is anything that warrants a 999 call eg cisterns are bloody hard if you bounce your head off them, and head wounds bleed a LOT, or obviously broken limb or serious injury. Sometimes I’m just concscious but dazed, and DH can manage to get me to open door and help me.
as he is a normal decent man, the last place he wants to impose himself is a single sex womens toilet as he is respectful of women’s privacy. It makes him feel anwkward annd awful having to do it, so Jazzy you could ask your DS how he would feel in the same situation - having to impose himself into a busy women’s toilet. I’d imagine he too would feel extremely uncomfortable and it’s worth exploring with him why other men activelywant and seek to do exactly that. your DS is a young man,he won’t be able to feel or imagine the invasion of privacy a woman would, but he can imagine how a man would feel invading womens privacy. if that makes sense.
obviously it’s a shit situation for everyone involved and I know DH always feels terrible. he doesn’t want to upset women, he doesn’t want to be judged as a pervert, and it’s just awkward as hell. if your DS imagines himself having to do that, it may give him food for thought?I also have a similar age DS to yours and atm I would never put him in the position, he would fucking hate having to do that. (btw all my DC who had drunk the koolaid a few years back and were horrified by me are all now firmly GC, in fact one said off their own back in discussion the other day “I can’t believe I was such a naive dick about all that before” so there is hope 
they grow older and wiser