I don't understand why some people on this forum, and all over the internet, do this - diagnosing themselves with a personality disorder (or DID for example) when it's extremely obvious they're just autistic or at least that's their main issue. I'm not talking about people who haven't researched mental illness a lot and are simply ignorant on the subject, it happens, but the ones that must have had a bunch of people suggest them they're wrong, yet instead of researching more they feel insulted by this even if they're told in a constructive way, or actually even deny their official diagnosis of autism.
A different diagnosis obviously doesn't make them a different person so they're still autistic. Telling others (online) they have a different diagnosis than they do only makes them look like an idiot when said others in this case inevitably find out because of their lack of social skills or difficulties they would have if the diagnosis they pretend to have is true, but don't. But this doesn't stop them and neither does age, which would suggest more life experience and more opportunities for criticism.
I can't imagine lack of self-awareness is the problem here so denial must be involved, but why? Anyone with a theory on this please let me know.