When people constantly dismiss and mock you like this, treat you like you're the problem, it creates a deep need to find an explanation and justification.

You should try harder to treat autistic people like people, instead of mocking and dismissing things you can't be bothered to try understanding. Comorbidity is a very real thing. Autistic people do have high incidence of comorbid conditions. Your narrow view of the world does not represent universal truth. Hypochondria is common among autistic people, because they commonly have real issues. When everyone refuses to take you seriously, you have to find your own answers. You're the problem here, bud.