These badges are apparently optional, so hopefully no school is enforcing the wearing of them. The blank ones are just asking for trouble and I think could make the atmosphere worse for children who are questioning their gender.
The questioning of 'gender' most often accompanies the stirrings, flutterings, and realisations around sexual orientation. The 'trans thing' is being conflated with sexual orientation - but with potentially damaging physical repercussions. Questioning gender is a common marker of homosexuality/lesbianism.