When I went to school (not that long ago) there was no mention of homosexuality in school sex education by law, and there was homophobic bullying. Even the most liberal teacher said "if two pupils were in a gay relationship, we'd cross that bridge when we came to it". Despite this, some of my school friends were gay, and plenty of people of my age are gay.

Do you have a link to back up this claim of schools teaching children to "find out if they're trans"? There's a difference between preaching tolerance and preaching advocacy.