We can have individual toilet cubicles with sinks and walls that go down to the ground, but that's not really solving the issue, is it?
It's about the precedent that gets created.
What about women's shower rooms?
What about women's changing rooms?
What about women's shelters?
What about women's prisons?
What about women's scholarships/awards/statistics?
What about women's sports?
What about women who want a female healthcare provider because they have been traumatized in the past?
What about the person who feels you up at the airport?
The transgender activism movement is a long sequence of "Oh, that is TOTALLY hypothetical and would never happen in reality... oh wait, dear me, it just did happen. Whoops! Oh well, too late to do anything about it now. The law is already passed--what can we do?"
For example: We have already had numerous incidents of dangerous male prisoners deciding that they are female and should have the right to be in women's prisons. Well-Intentioned but poorly-thought out laws which increasingly base gender identity on self-proclamation alone are leaving us in a situation where we have no legal way to get rid of people like this.