Before a parent allows their minor child/toddler to choose their own gender, they should first start with letting the child choose their own food for every single meal and snack, their own clothes, and their own bathing schedule.
Unless those choices work out well, the bigger life-altering decisions need to be made by the parents -- at least until the child is no longer a dependent.
Parents, guardians and school faculty have an obligation to make choices on behalf of the children they are raising. Abdicating that responsibility is why we are where we are.
I'm not advocating for 100% control over all choices, just the decisions that can have negative life-altering effects.
My wife and I have raised a lot of kids.
Most all were not ours.
We only have a daughter,
but we have a lot of kids.
It works this way, Parents, Aunties and uncles set rules and the children
follow them till they are old enough
to decide on their own what is right for them.
That is it. I don't care if the kids aren't happy with that.
What is that age?
That is a hard one.
I'll throw this out there
16 for girls and sex.
18 for all on booze and contracts.
21 for military service.
BTW I went into the military at age 17.