I do not find it odd that there is preferential treatment of one child over the other in the secular school system. The liberal argument here is that a person should be called by their preferred pronoun and this can be accomplished by force or coercion. Removing the boy who described the reality of the situation from gym was clearly meant as a punishment and school is lying to cover it's own rear.
So it's not really liberal at all. Clearly the school favors one side, that is the transsexual side.
Someone should tell that boy who identifies as a girl that removing his penis won't make him a girl, it'll only make him Eunuch. Also they should be honest about the horrors of artificial vaginas and the consequences of any such butcher work. I have a feeling it would scare most boys off it.