they can claim what they want, but all of their desires for surgery and hormone treatments should be paid for by them. Also, their decision to get any of that stuff done should only be done by adults. Children should not be a focus of this Trans issue, and gender-affirming care should only be given to Adults.
Let children be children. Let people decide what they want to consider themselves once they are adults and are responsible for the full consequences of their decisions. Last, no one is required to play along with their mental illness on this and they should not be able to enter female spaces based on their declared gender, but instead based on their sex.
The above is part of my position on the Trans issues.