I don't really understand how you can be trans and
not experience the gender dysphoria... it's gender dysphoria that causes the extreme distress due to their biological sex. So for me considering that transgender people are people who experience extreme distress due to their biological sex.... I don't understand how you can be trans without that. But I don't know
This is, I think, the main issue that's causing all the arguments.
What the majority of people understand when they see or hear the word trans man/woman/person is the idea of someone who is so certain they were born in the wrong body that it causes them deep distress to inhabit that body without surgical changes, just like your son (who is very lucky to have you).
The vast majority of women have absolutely no problem with trans women in this category sharing their facilities, they have done for years. In the main they're all about blending in, trying not to be noticed and they accept that they'll always be biologically male.
However, the trans rights movement has been hijacked by a second type of trans person, the autogynephiles. Autogynephilia is when a man gets turned on by the idea of himself as a woman and transitions because of that. (In the old days we would have distinguished between the groups as transsexual and transvestite, but some consider these terms offensive now). The autogynephiles rarely have their penises removed, though some do have breast implants and facial feminisation surgery, and refer to the dysphoric surgical path trans people as tru-
rum.
Part of the autogynephile fantasy is to be accepted as a woman, hence the reason a third space is not good enough. Being in the women's toilets, changing rooms, on female sports teams, all enhances their sexual fantasy. These are the people telling JK Rowling to suck their lesbian
wicks and it's these people who are pushing very, very hard for the reform to self ID laws so that anyone who says 'I am a woman' gets instant access to all female-only spaces, regardless of their biological gender.
This is what the gender critical feminists are so concerned about. (a) because no one should be made to participate in someone else's sexual fantasy without their consent and (b) far more seriously, at the moment the Equality Act allows for single (biological) sex spaces, like toilets and changing rooms, for safety and dignity. If the law changes so that a man who says he is a woman can walk into them, women lose their right to challenge anyone who might take advantage of that change to threaten their safety and dignity. At the moment if I'm in a public loo and a guy walks in, I can (just about) say 'Sorry mate, you're in the wrong one,' and his reaction to that will me whether it was a genuine mistake or whether I need to call 999 and look for something to defend myself with. But if 'Sorry mate, you're in the wrong one,' becomes a hate crime, it leaves women in an extremely vulnerable place.
Sorry, major essay, and I'm typing on my phone, so please forgive typos! I'm only a couple of years down this rabbit hole, so I hope if I've made any errors in the above someone will correct them.