Some LGBT activists think Christian parents should be prosecuted if they seek Christian counseling for a teen who suffers from gender dysphoria. If your son says he's really a girl or your daughter says she's really a boy, you should affirm their self-identification.
Do they apply the same logic to anorexia? What happens when other people see a gaunt teenage girl and think to themselves, "She's awfully thin. She's downright emaciated"–but when the gaunt teenage girl looks at herself the mirror, she thinks to herself, "I'm fat! I need to diet!"
Should her parents say, "Yes, honey, you need to starve yourself."
What about someone who suffers from species dysphoria. Take lycanthropy. He self-identifies as a wolf.
Should we let him run around naked in the woods in sub-zero temperatures, looking for raw muskrat meat to consume? Should we let him die of hypothermia or malnourishment? Or does he require a medical intervention?