What is anti-social Behavior?
Any behavior that is contrary to the accepted norms of a society.
It is very important to recognize that anti-social behavior is dependent on the local culture. Beyond that, behaviors that disturb the civil flow of community interaction - thereby disrupting the society – are “anti-social”. This is based on the precept that “society” requires peaceful, non-harmful interactions between its members. Any activity that does not conform to that general definition can be considered anti-social.
This also includes individual isolation mechanisms. Although those may not adversely affect the society at large, they deny the inclusion of the individual into the society, even if self-imposed. As an example, both suicide and murder are (extreme) anti-social behaviors.
Similarly, being a recluse to avoid social interaction is anti-social behavior, as is being extremely rude in public to obtain a similar result. In both examples, one extreme is internalized, and the other is externalized.