Yes @ShockedandStunnedRepeatedly. It's the same baffled, frozen response as when men who say they "are women" claim they can "feel" or experience things that women feel, therefore they can be a woman - but men can't feel those things, they can't experience them, they can't know them. Every day when a woman goes out into the world, all the time, there is a level of consciousness about the presence of possible danger from men. It's something we learnt from when we were very young.
When my sister, who experienced sexual abuse and assault as a child, is faced with a trans woman in the toilets, she freezes. It's a shock. She knows this person, she isn't necessarily afraid of them, but her body reacts.
When we begin our menstruation, that's the beginning of our womanhood. Our bodies are getting ready to bear children. And for some of us, periods are painful, the time before the period begins is intensely stressful, the powerful forces that manoeuvre our bodies are not under our control.
Just as being a woman isn't about wearing high heels and make up and a wig, having a period isn't about bleeding. Menstrual blood is a side-effect, a concrete demonstration of what's going on inside our body.
So yes, we are being mocked. What our bodies tell us is mocked. Our womanhood is stolen, and copied very badly, and taken away from us.