The reason you can't let Trans Women compete in women's sport is that they are men. The reason you can't let Trans Women into women's bathrooms, changing rooms, spas, shelters, or prisons is that they are men. The reason you can't force people to use gender-based pronouns is that compulsory lying violates a right that everyone holds not to be coerced into saying things they don't believe. The reason you can't chemically castrate and dismember confused children is that children can't consent to medicalized harm. The reason gender medicine isn't medicine is that it's never been evidence-based and it's inherently self-harming. The reason you can't teach children that any of them can change sex is that the claim is a lie. The reason you can't build a civil rights movement out of people pretending to be something they are not is that "people pretending to be something they are not" is not an actual group, the group has never been oppressed (except by the binary and immutable nature of sex which is beyond the reach of any act of human self-determination), and there is no such thing as a duty to see someone as they see themselves or treat them as something other than what they are. The whole thing has to be refused in its entirety.