If I'm allowed to be pedantic, and going beyond the story under discussion, people can (and should be allowed to) disagree even for medical issues. It's not just blind trust to whatever diagnoses doctors do. Talking of course here for "soft" diagnoses -- few would disagree with an actual physiological diagnosis of a medical problem.

Until a few decades ago, homosexuality was a disease that was OK to be cured with things like electroshock treatment. Heck, people had lobotomies inflicted upon them, in the 20th century, for all kinds of BS reasons. Here on HN too, many will attack the prevalent over-prescription of drugs and diagnoses of ADHD to children.