Well the two aren't mutually exclusive any more than other personal traits. A guy in a wheelchair can still be an asshole. The big sign for any sort of social ineptness is remorse if they find out they accidentally hurt someone. Although that definition may also be somewhat values influenced. Asian people are often stereotyped as rude for instance because of different standards. A grocer just silently bagging your goods and only speaking the bare minimum might be considered rude but for them it is the norm.