Gendered tasks, clothing and socialization are exceptionally cruel for transgendered children. My schools were very strict about uniform, which was dresses for girls and trousers/shorts for boys. Any parent who forces their son to wear dresses despite their protestations would be investigated by the authorities, but nobody stands up for trans children being subjected to the same abuse. It was utterly humiliating.

The other big problem is that teachers like to split groups of children into 'boys' and 'girls' for certain activities. This forces transgendered children to self-identify as the wrong gender, because any attempt to join the correct group will result in them being corrected and quite probably made fun of. – Jon F