This has already been explained to you 20,000 times. Other protected characteristics don't need their data handled in a different way because HMRC DOES NOT HOLD information on people's ethnicity, sexuality or religious beliefs, or on any other data that would be considered "special category". For most people, the only protected characteristics HMRC would record are sex and age, neither of which are special category data (it is not a trans person's sex but their trans status which is special category). A trans person without a GRC does not need their data handled in a different way because HMRC would not at that point be holding the information that they are trans as they cannot change their record without a GRC.
You don't have to stick around, you know, just to prove all of us wrong.
Well, yes, this is what happens isn't it. Anyone who speaks out about the amount of hateful, ignorant, ragebaity, reactionary, uninformed or just plain false information that gets shared on this board on a regular basis gets brigaded, dogpiled and bullied or gets so fed up and exasperated they leave, leaving nothing but an echo chamber that gets increasingly nasty as the people in it lose all sense of proportion as to what is a normal way to talk or think about other human beings.