Yes, Christian schools run by Christian churches must teach the children to hate all homosexuals, as this is the position of the Holy Bible.
It is important for Christian parents to each their children to hate what God of the Holy Bible hates.
God hates homosexuals, so Christian parents must teach their children to hate homosexuals and transgender people.
God expects Christian schools that submit to the Holy Bilbe to teach the children how to hate homosexuals and why they should hate homosexuals. This is the will of God for Christian schools in America.