Honest question, where does this idea begin and end? Having the freedom to be and think whatever you want sounds great on paper, but at some point, that bleeds over into real life and the rest of society.
This isn't a debate simply on personal freedom, child rearing philosophy, or the relationship between a patient and doctor . Obviously those things are important and deserve to be acknowledged and respected, but are they limitless?
There's also a question of science and that answer will have a broader societal effect. We should care about what other people are doing and saying to their children because whatever is done to them is eventually going to be something that society has to accept or deal with in some form or fashion.
Just on the basis of morality alone we should care what happens to other human beings, especially to children.
I understand not caring about what a bigot thinks. There are people that think this whole thing is simply "gross", and don't care about the science. No scientific report would ever change their mind. But there is plenty of valid reasons why a rational society should care about what kind of surgeries and medication a child can have. That kid isn't going to live on an island. He/She is going to interact with other people, go to school with other kids, have a job someday, want people to understand and respect whatever they have going on, etc. So to expect society to just accept whatever they throw out there without questions and critique where appropriate is simply not realistic.
We can already see a lot of the negatives effect of people doing whatever makes them happy in the moment.