why should anyone have a right to a change in legal status based on a subjective sense of their own identity which can't be observed or defined objectively by anyone else?
It's an excellent question that neatly summarises the problem, but I'm not sure the TWAW brigade see it as a valid question.
Conaghan sort of mentions it:
Gender critical feminists have also expressed concern about the perceived elevation of gender identity rights over those of other legally protected grounds, the assumption being that equality categories, such as race, religion, sex, gender reassignment etc, should always be accorded the same level of consideration.
...and then twists herself into knots trying to explain it away with word salad and vague references to third sex and 'narrow conception of sex' (like Sally Hines did when she was put on the spot).
These people are incapable of considering the practical meaning of legal status or its real-world consequences, because believing that TWAW prevents them from questioning anything. To them it's like asking whether someone is really gay. Of course it's completely bonkers, and it's scary to see how widespread this belief is.
Hansard report on the Self-identification of Gender debate
Layla Moran: There are many forms of the human body. I see someone in their soul and as a person. I do not really care whether they have a male body.
The proposed reforms are proportionate and considered. They are not knee-jerk and they understand that such decisions are some of the most personal that a human gets to make. It is about who they are, and how they fundamentally identify.
Dawn Butler [to David T. C. Davies] You made a comment about people who are “unfortunate enough” to suffer from gender dysphoria. That has very negative connotations, just as it used to be said that people were “unfortunate enough” to be gay, to be a woman or to be black. The way you speak was picked up in your talking about simplifying—