"And nonsocial, well, it's not really applicable to human beings."
It's probably better to ascribe the terms to behaviors than persons. Of course there's no people that have like ZERO social interaction, but certains behaviors could be considered nonsocial, like CzeCze's room lurking!
Then again, how would you describe a person who's been catatonic their whole life? I think it would make sense to call that person nonsocial even though they still have some capacity for being social.