Easy. The public education system is nearly entirely under democrat control. They therefore parrot the prevailing party line to millions of impressionable captives (students). Whatever the message is, in this case sexual confusion, it’s force fed daily with predictable results (lots of sexual confusion).
True, you would be surprised at what you believe that has been disproven for years simply because they brainwashed you.
Epigenetics matters, they know that, you do not. Institutionalized children are de individualized and reconstructed. Same tactic as the military. The chemical brain and body changes result in genetic switches being turned off and on.