So according to popular believe, if your friend or whoever avoids social interaction, they're antisocial, 'cause if they don't want to do something social, they must be anti social!

Yeaaah...No.

I get how people think that if someone who is reluctant to participate in social situations is categorized as antisocial. However, in fact, these people, the antisocial ones I mean, are often pro social, even unusually so!

Antisocial Personality Disorder is diagnosed in adults (18 years or more) who consistently disregard and ignore the rights, are impulsive, irresponsible, lie, or generally act recklessly with no concern for the safety of themselves or others. They are often extroverted and very much the opposite of the type of people who are so often called antisocial, who care about other people's feelings. These people are usually just shy or have social anxiety disorder or maybe avoidant personality disorder.