I kind of wondered that myself. Also wondered about overcompensating.When medical professionals are evaluating people under such circumstances, consider it a holistic examination process. That whatever comes out of your mouth may be every bit as relevant as to what your body tells them, apart from medical records provided by third-parties.
It would be unfortunate if one's attitude and choice of words contributed to the assessment of a medical professional with the rank of Captain or higher. Where sometimes there's a fine line between being cocky and disrespectful. It also doesn't help that narcissism is sometimes mistaken in cases involving considerations of autism. It would be sad if it was his attitude that really sank him as opposed to only a subjective analysis of his medical records.
Of course we don't know what actually went down. Only that based on the original post that there are a number of things to consider into why the OP was turned down for military service.
I agree with the narcissism sometimes being mistaken in cases involving considerations of autism, but there is distinct difference. Narcissism there is a lot of grandiose thinking and not following rules because they are above that and they keep everyone beneath them any way they can. With autism, it's hard to think past self as far as being interested but I think that's about the limit. We definitely don't believe we are better than everyone else and we do care about other people. If anything we will have self esteem issues.