The parent comment was merely questioning the validity of your weird assertion that "People are labelled mentally ill IFF they do things that have a stigma attached". Perhaps you meant "people who do not self-identify as mentally ill but have that designation imposed on them." Maybe you'd have a case there. But the fact remains that many people suffer from mental illness, and it isn't always just a case of society rejecting them for being "different."

He was what doctors call 'high functioning.' He was able to operate in society and shroud his pain though it was incredibly painful to do so for him. He wasn't 'completely normal'. He was in a very well respected program in Boston and working through his issues to have the life he wanted.