So, some early forms of "treatment" which are still being employed for gender nonconforming youth (primarily boys) really were another form of anti-gay conversion therapy.
That is, parents of non conforming children were instructed to force their children to perform stereotypes consistent with their biological sex. E.g. a boy must wear "boty's clothes" and must have only "male friends" and that this would cause him to eventually become comfortable with "being a boy".
In the sense of forcing people to engage in behaviors in order to "change" them, it is not dissimilar to homophobic conversion therapies that did things like force gay men to masturbate to images of naked women, or in the much more abusive vein, to be given electric shocks when looking at images of naked men.
The alternative to this being pushed is to allow your children to believe they actually ARE the opposite sex.
What is completely being neglected is the sane, loving and non-sexist alternative to both of these. Let your kid wear whatever they want to wear. In fact, celebrate that. Tell them they are brave and protect them from bullying. But let them know, with kindness, that unfortunately it is impossible to change their sex and they will eventually grow into a man (if a boy now) or a woman (if a girl now).
The problem is that the homophobic masses don't want this to happen, and the men's rights activists don't want this to happen. They are far to invested in gender roles and stereotypes to allow it.