Let’s not pretend that being female is the same as having complex special needs, please.
Perhaps 25 is too far, I personally wouldn’t have an issue with a disabled grown man being changed in the same room as me, because I’d recognise the level of need. I can understand why it would be unnerving perhaps, but I’d just see it as someone with complex needs getting dressed.
We can’t currently leave him unattended, at all. If we were out in the community and I needed the loo, I’d have to take him in or wait.
You’re not just going excluding males, you’re excluding their mothers on those occasions too.
My assumption was that people would look at someone with clearly significant need, and have some compassion. It turns out they maybe wouldn’t.
If you don’t expect understanding for your son’s needs from the general public, that’s a shame but your prerogative.