This argument doesn't go anywere though. By this logic, why not just do away with single sex spaces entirely? Or, indeed, why shouldn't transgender women and men share spaces instead of transgender women and women? Afetr all, everybody is different. We're all human. Why do you think the “woman” category is meaningful but the “male” category isn’t?

You're trying to simultaneously make the case that different categories are and are not important depending on the result you want.

The fact that I'm a male doesn't tell you anything about me either. Except that I'm not female. And on this basis alone, I'm asked not to enter female spaces. There are many good reasons for that. One of which is that we can very safely assume that I haven't had "the surgery." The fact that you mention this also shows that you understand that it's not meaningless.

And to your point, I'm not defensive about questions like whether I'm circumcised (yes) had a boob job (no) or had my tonsils removed (no). They're not relevant to this conversation, but other things about me might well be relevant to others. And if they were, I’d be honest. The issue is the idea that anybody, trans or not, has the right to insert themselves into different categories solely on the basis of what's going on in their heads, and keep any relevant information secret.

This is not a human right. It’s a demand that is actually very unreasonable.

If I wanted to go to Mecca, for example, Muslims would want to verify that I've met whatever standadrds they specify for entry. And if I insisted on withholding that information, I'd be denied entry. Respect is a two-way street. And respecting people's boundaries is part of that.