Well, I think you missed a couple of things here. (Noting this may have come up in numerous other threads about this)It is an argument though.
You may not think it's a good argument, and that's fine, but people are allowed to be sceptical of your motivations. The fact that you're more worried about some hypothetical situation where men pretend to be trans to gain access to women's bathrooms, which is actually completely unnecessary and wouldn't provide very much, if any legal protection beyond what already exists, does not register as authentic if that's the only situation you've demonstrated any concern for victims of sexual assault.
I'm of course joking about making men pee in glass boxes, but there's a grain of truth in it. I personally do feel inherently less safe around men, I've been a victim of a lot of male violence and there's always going to be deeply wired part of my brain which associates men with threat. I think we all, consciously or subconsciously, recognize that men are dangerous, that the way they behave and act makes them a danger to others, and that there's something very wrong with men in our society. Not all men, of course, that was a joke, but enough men to make the threat very real. It is interesting to me to see you admit that men are a threat to women (and trans people, and GNC men), because previously you've resisted the idea that there's anything wrong with men as a class.
So let me phrase the joke as an argument. Why are you so concerned with punishing trans people for what is ultimately a problem with men? Would it not make more sense, instead, to focus on men, because ultimately the social problem we are talking about here is men.
HOW are you going to determine that someone is trans? Eg. If a ‘manish’ looking woman comes up to the bathroom, who gets to determine whether they can enter? Most toilets don’t have guards. So, I assume that the general population will have to call the police to fix the situation. Do the police have a right to strip search someone checking for genitalia? What happens if they have a vagina? Or do we have to do chromosome testing before anyone is allowed in? What happens to the accusers when they falsely accuse a cis woman as trans? Remember the Olympics when women had to strip before competing? And how that wasn’t effective and men still got in and competed in women events?
Also, if you are a pedophile, you don’t need to become trans at all. Because.... and I can’t stress this enough, no one is guarding the door. You can just go in. Like, the Yaniv situation.... I don’t care if you are a man, woman or trans. Her actions is dodgy regardless of gender. Pretending her as trans is the problem doesn’t give the whole picture because it wouldn’t be acceptable behaviour by anyone