I have used both mens and womens bathrooms. And there has never been a problem. No ones brought anything up to me, and that is because I have passing privilege either way. So despite what others were saying earlier, I DO have a privilege within this minority. I pass in ways others cannot.

It's perfectly legal to go into either bathroom in most states in the US (that I am aware of). This is simply a construct of "sex" segregation. We haven't said rid of all sexed bathrooms. We said that a gender neutral bathroom should be an option so everyone can be comfortable.

And I am a bit out of it physically and I didn't see some posts. There is no such thing as "biological gender". Sex is biological. Gender is not.