Not even just orientalism, it’s straight up racism and white supremacy. They are fine with Asian trans women but not white trans women because of A) their fetishizing of Asian women in general and B) their concerns about the white race “being outbred”. They want all white people to be straight baby factories while they want other races to be their sex objects, (what they consider) men and women alike.
Not to get all Asian incel either but this is part of the rights’ more broad goals of feminizing and emasculating Asian men. If we want to discuss the phenomena honestly we need to address the level of anti-Asian racism that our society openly tolerates as normal.