My thought is that the personality disorders can likely be back traced to MBTI types pretty easily if you look at the absolute worst case scenario of a person's development and what might happen to thier type under the utter worst conditions.
When there life goes really badly thier natural type adapts/warps/twists in odd ways to handle this-and you end up with personality disorders. This actually might be a better thing to study/understand than the utter cluster that seems to describe the personality disorders right now. Totally my thoughts though so likely full of crap in a huge way.
ENFP-borderline personality/maybe histornic tendancies
ESTP-Narcissism and sociopathic tendancies
ISTP-Antisocial and sociopathic tendancies
I think INTPs would be more likely to be Avoidant and maybe schizoid but I have read so, so ,so little that I need to read a lot more. Not true sociopathic at all though...
Likely when poeple say this crap though, they just dont get or understand what being an INTP means and they just see different. I have lots of you guys around and, while odd, (like I am one to talk), you guys have a lot of awesome qualities.
My favorite INTP was about as enthusiastic as an INTP gets when I showed him the MBTI profile of an INTP.
He said he felt like he was part of an alien race that had been moved to this planet and survived but was mixed up with lots of other aliens. He said it made him glad not to be alone.