Because it never, ever seems to occur to some transwomen that that instead of them passing, what they are experiencing from actual women and girls, is fawning or acquiescence.
I agree it may not occur to some, but it certainly does to others.
It was only a few years ago that the bloody Guardian actually published an article from a trans identified man who went shopping with his wife and when he was paying for his female clothes he smirked at the sales assistant, because he knew how uncomfortable she was.
The Guardian in its infinite misogyny, thought it was all fine and dandy to have a positive article about a fetishistic man upsetting a young girl and enjoying it.
My point being that many of these men positively go out of their way to discomfort women, and many other men think there's nothing wrong with it.