It's utterly bizarre that she hasn't twigged that transgenderism and potential accusations of transphobia is the likely reason shop staff are reluctant to challenge a man in the ladies' changing rooms, and ironic that she would throw blanket accusations of transphobia around on Twitter in light of this.
Does she see that calling anyone who acknowledges sex differences transphobic is exactly why she had that experience where no staff wanted to get involved?
Really strange to care so much about sex differences when it comes to herself but to pretend it's a non-issue when other women feel uncomfortable in the same situation, just because this man was presumably wearing trousers.
I also wonder whether the part about the man giving her a lecherous look outside the fitting room beforehand was actually true, or if it was the only way she could frame it as a story about an undisputed sex predator as as opposed to a random man in a woman's space for what could turn out to be potentially 'innocent' reason, such as being mistakenly placed in the wrong body at birth.
It just felt forced, like she knew she couldn't complain about a man being in the changing rooms unless she could evidence how she was sure he was an actual pervert first - because it's not ok to segregate by sex so only perverted men who are committing an actual crime aren't allowed in women's spaces. But all the men who do it on the sly are welcome, as only bigots care about sex.