To claim that depression is not a mental disorder is ridiculous.
No-one has.
You’re just too lazy to read any of that and you’re too proud to admit what moronic bullshit it was to say “it’s just in your head.”
Your reading comprehension is garbage and you don’t know the first thing about psychiatry.
No-one has.
You just did. By claiming that depression is not in your head.
Depression is a mental disorder and by the virtue of being a mental disorder is, quite literally, in your head.