My brain told me I was a bird when I was 5.
No, it didn't, it told you that you were a little girl, who wanted to fly like a bird for a time.
And if male and female genders are genetic, how do you explain XX males and XY females? Without seeing them naked you'd be unable to tell their gender and based upon looks I'm quite sure you wouldn't want an XY female in the boys locker room since she looks exactly like what what you'd call a little girl. That's because, ...................................................................wait for it, ...........................................................she is...
And I am equally as qualified as you, perhaps moreso since you are years younger than me in experience and wisdom (quite obviously), to say that "Jazz"'s brain was telling him he was a boy who wanted the attention of a little girl and wanted that attention perhaps as an addiction for a much longer time.
In my case, I didn't give a fig about whether or not anyone paid attention to me and my desires to fly. I just really liked flying in my dreams and was sure I was a bird "therefore". It was kick-ass and still is. Only the difference is that someone sat me down and explained to me that my DNA meant that humans can't fly. Just as someone needs to sit Jazz down and tell him that his DNA means that even if they amputate his penis and testicles at age 18 (after years of coercive/abusive influence and indulgence by his mentors), he will never ever ever be a female. He will simply be a mutilated freakshow with incontinence, sexual numbness and the same level of depression &/or confusion he had before, perhaps worse.
This show should ONLY be aired if the title is changed to "I Am Child Abuse". Bruce Jenner's show "as Caitlyn" should be called "I Am Narcissism Gone Wild". Then yeah, air both of them under those names and they'll be a service to mankind via example.