What's the difference between a man who says he's a transwoman and a man who says he's a transwoman but (according to you) isn't?
There's no difference. They are both men. No discernible difference at all. Classic illustration of how totally bonkers it is to have us believe some men are pretending and some aren't.
You haven't thought this through have you?
You are admitting it is not trans women who are the danger, it is men who are imposters. They are criminals who endanger women, be they cis or trans.
Imposters do not compain to the GP about experiencing gender dysphoria, attend a gender clinic for repeat appointments for not less than two years, each time expressing the urgency of their need to transition. That forms the basis of a diagnosis, also working in their acquiring gender, have changed their name, changed their documentation as far as possible, using hormone treatment, then that is a much different case to a man putting on a cheap dress, wig and shoes and saying to a member of the public ''I should be here I'm a trans woman''.
If somebody tells you, that the diagnosis of gender dysphoria is expressing it, then that obviously needs to be expressed to a psychiatrist with that specialism, not a busybody in the works toilet eyeing everybody with suspicion.
What the Kelly and Peggie cases have together established is that mere presence of a trans woman is not tantamount to harassment - there has to be accompanying evidenced misconduct. Kelly suffered no detriment, Peggie harassed Upton. Those are the judgments we have.