And this is the cursed vein that "social contagion" comes from. You don't really hate your trans child. You love your child who only caught the trans from the environment. There is no moral obligation on your part to love your child as they really are as you're seeing surface manifestation of peer-pressure and anxiety. The real child, your fantasy of what they were supposed to be, is hiding in there somewhere.
And as I've noted before, in this way the bigoted parents are also victims of a scam.