The issue is more that it has always been kind of +/- for strict sex access, with women occasionally in the men's room and vice versa, but now transwomen are being grabbed by the throat and told "but not you, perv. We have different rules for your kind". That really doesn't feel right.
You seem to be willfully ignoring the actual situation, and instead you're substituting some activist-generated narrative here.
Yes, historically there has been some occasional usage of opposite sex restrooms. The key word being occasional. And the context being 1) accidental use of the wrong restroom, 2) extreme need that necessitated a reasonable exception, or 3) the very rare well behaved transsexual who was tolerated out of courtesy and who did their best to avoid making females uncomfortable. In all of those cases, it was a rare exception being made on a conditional basis.
Much like we historically might have allowed a complete stranger to use our phone to call for help, on the basis that we believe them to be low risk and contingent on them behaving appropriately... but we always had the right to say no and to deny them access to our homes if we, in our sole view, decided they were suspicious or threatening or otherwise perceived a risk of some sort.
That is not the case any longer.
Now we're being told that we are obligated to let in any male who says they have transgender feelings, regardless of their behavior, regardless of whether we perceive a risk, and regardless of how we feel about it. It's being FORCED on us, under threat of both law and physical intimidation. And to add to it, we've had years of seeing males to whom courtesy was extended turn around and post videos of them masturbating in female restrooms, confronting females in our own space and calling us names and threatening us.
These males with transgender identities that you're so committed to defending are highly invested in applying force, coercion, and intimidate to females in order to override our boundaries and rob of us the right to say no.
Why do you support that?