Why is this issue so important to the Left? There must be a reason, and it is NOT sympathy for the plight of a sexually confused young person.
The parents, counselors, teachers etc etc will never let this boy change his mind. Probably a future teen suicide.
Yours is the only pertinent question here.
Do with this as you will. But I don't think this is a question of left and right as you have suggested but rather one of good versus evil.
That's the thread of consistency which ties together their whole program: contraception-sterilization-abortion-buggery, videoporn, masturbation addiction, corruption of morals of middle-schoolers via vice indoctrination as sex-ed, lesbianism, radical gender ideology, the deconstruction of marriage and family.
It's to destroy the flourishing of natural sex and natural marriage, which leads to natural procreation. Of the one species they truly despise.