Except that I've actually seen it happen, a couple of times. Primarily, the persons who hired the men did so because he disliked having women in the work place, but when forced to (by law) he always paid them less.
For clarity, it was Brenda/Bruce (Brian was the undamaged twin).3) Look up the Brenda/Brian case.
Yes, forcing a genetically male person to live as a girl would be a problem. But the question is not about what a girl is, but her preferences. If raised as a girl, given girls toys to play with, encouraged to like girly colors and things, would Brenda/Bruce reject those things in favor of more boyish toys? There's still a lot of work being done in this area, but some studies show that HOW a child is raised has a marked influence on her choices later in life.
As for standing while peeing, this is a societal preference, not a genetic predisposition. Brenda did not have a standard urethra, but urinated through a hole in her abdomen, probably through a tube. It would likely have been much easier standing!