JulyKit Surely the part of my post which you didn't quote evidences that lumping people together homogeneously, with any or no societally constructed division, is the opposite of what I believe is right?
'Sex based rights' aren't as simple as they sound. For example, some women are afforded more rights in the workplace than others because they've had children. Others, who haven't, are marginalised.
A poster upthread mentioned privilege (in the context of being imprisoned alongside a trans rapist) - privilege can transcend all manner of rights. Does a highly privileged woman deserve sex-based rights over and above an under-privileged and marginalised man, for example?
When you add trans into the equation, the situation becomes even more complex. Another poster asked whether a transman would still need sex-based rights - the answer is yes, and the reason is, again, privilege.
To summarise - not all transwomen are privileged white males. The approach taken by Maya and applauded by JKR vastly over-simplifies the situation, into an Orwellian non-trans - good/trans - bad philosophy, which is why I reject it.