I can understand their outrage though. When you've been socialised as a man and have lived with male privilege for most of your life, suddenly being thrust into the normal experience of women may be a horrible shock.
I wonder if this is why some transwomen feel that they are bigger victims; because they didn't expect to lose some of that privilege.
Females are discriminated against constantly. We have to be vigilant about what we wear and where we go and how we travel because so many of us have been subject to sexual aggression or assault, throughout our lives.
When we raise the low level harassment and discrimination, others often downplay and minimise it. Which reinforces the feeling that we are not truly safe. When conviction rates for rape and sexual assaults are so low, we understand that even when the worst happens, we are unlikely to be believed, or to see justice.
Yes, I can see that they would be a shock for transwomen.
But that's part of what it means to be viewed as a woman in our society. And unfortunately females can't choose to identify out of it.