It is also not "a courtesy" that we "allow them" to use the women's. It's the law.
No. People with a GRC must be treated as their acquired sex unless in a situation where this doesn’t apply e.g. sport. This is in the GRA 2004.
However most trans people don’t have a GRC. You can’t discriminate against somebody because they have the protected characteristic of gender reassignment, but it doesn’t follow that somebody without a GRC is suffering discrimination because they are treated as their legal sex. Similarly a bus company is not discriminating against me on the basis of sex if they legally discriminate on the basis of age and don’t allowed me to pay a child fare.
There is no particular law about toilets. There are health and safety regulations for workplace toilets.
I am always really disappointed when "safety in prisons" is reduced to "no trans women", rather than to go much further and demand prison reform
As you must know, the concern is about men in prisons. If you want to make an argument that trans women aren’t men, you will need to explain where the line is drawn and why, otherwise you are just arguing for unisex prisons. If you think unisex prisons are a good idea make an argument on that basis.
I can see, she is propagating the notion that self-ID would somehow make life more dangerous for women and that is just wrong. It would just make life a wee bit easier for trans folk.
No you are wrong, unless you can explain why trans women are women and who is excluded from that definition. Otherwise women are very definitely harmed because the term ‘woman’ becomes meaningless in law and policy.
I really don’t understand why you haven’t yet grasped the fact that you can’t protect the rights of a group you can’t define, whether that group is trans people or women. This leads me to believe that your concern is less about rights and more about validation, regardless of who that affects.