You mean like putting a divider between urinals? Because that already exists as an option. Then no one can look at your precious little Mr. Happy.

Trans men generally use a stall anyway, what with usually lacking what they need in order to use a urinal.

And plenty of cis men also sit down in a stall if they need to urinate.

So men do have that privacy. Even trans men. The problem here is that you don’t think trans men are men.