Trouble is, bathroom seperation exsits, to seperate would be victims, from would victimisers. And people fail to understand, that beings trans woman, makes us would be victims too.
That's how a femail cis freind of mine put it, during a time of discomfort, concerning legality. She turned around and pretty much told me, those signs on the doors don't mean, man and woman. But hunter and prey, and pointed out that I'm prey.
Of course everybody becomes a target for countless reasons anyway. But their is still things we can do to avoid some situations.
Sigh.... Many of the problembs we face, are as a result of cis men, and cis womans fear of them. I'm not talking good men of course. But that bad people everybody is scared of. If it wasn't for these people, nobody would panic we might be like them

But all I can say is, (forgive me for sounding like a broken record) the chances are who ever made that sign has never met and/or taken the time to understand what gender dysphoria is about and/or like.
A person is smart, but mankind is stupid.