I'm not sure. Seems to me that even in relatively regressive jurisdictions trans women have all the same legal rights which cis men (like myself) do. What they would like are a different set of legal rights (e.g. Title IX protections) previously reserved to natal women.
In other words, there is already discrimination happening based on sex and they would like to be part of that existing discriminatory regime, based on the sex with which they identify rather than the one they happened to have been assigned by accident of birth.
Precisely.
Of course saying this means you are a transphobe and a bigot.......