Ideally, in public settings such as schools, transgenders would be allowed to use private bathrooms. If such an arrangement is not available the transgender should be required to use the bathroom that matches the student’s gender as classified by their pediatrician.
If other children are uncomfortable with an African American sharing their bathroom, why should they have to accept that situation? Despite scientific explanations that you can offer for African American identification, will always find it comforting. Why are't advocates for African Americans acceptance more sensitive to the feeling of the vast majority of the population?
Ideally, in public setting such as schools, African Americans would be allowed to use private bathrooms. If such an arrangement is not available the African American should be required to use the bathroom that matches the student's color.
Such a comment would be considered bigoted and illegal for African Americans. Why not for transgender people?