Do you think a preteen is old enough to self-diagnose as transgender? I think I'm going to tell one I know that they shouldn't diagnose themselves.
Why do you feel that way?
I'm tired of people thinking they know themselves and the world better than they do
I'm not sure they need a diagnosis, but it is important to get help from a profession when dealing with gender issues. Transgender kids usually face issues that a mental health professional can help them deal with.
They would know better than you who have never been trans yourself. You're a cisgender bigot.
This can be a difficult subject for kids to handle on their own, so it may be helpful for the transgender preteen to talk through their feelings and struggles with a mental health professional trained in gender issues.