Because they are hoist with their own petard. They can't say this guy isn't trans, when they are pushing for complete self-identification.
Exactly. The transwacktivist demands are bonkers.
Since they have no re-defined from transsexual to transgender, it is entirely justified to remind them that prisons, toilets, et cetera are sex-segregated, and not gender-segregated.
No male has the right to use the women's toilets or demand of women that we use female pronouns for him.
Some women might choose to use whatever pronouns someone wants, because they're nice people, and that's their decision to make.
But once you force someone into a game of make-believe, that's not a game anymore, that's brainwashing.