It's very odd that being a transboy could be real, but not a boy-boy.
What struck me about the whole thing is how developmentally inappropriate it was for children that age. I find myself wondering how people who deal with children think their kids are understanding these ideas, because to me it's pretty obvious that they aren't, and probably couldn't. They also seem to have odd views i many cases on gender stereotyping, talking to kids about things like racism, often expecting them to conceptualise at far too high a level.