The difference is, is it pro-social or not? Not whether it's good for the individual. Charging enemy machine gun nests is pro-social behavior, arguably. Killing yourself because you're in constant pain is anti-social.
I'm just saying that social mores line up more with what is pro-social vs. anti-social, not what is good for the individual (which is more ambiguous anyway).
This is just a way of saying "is it good or not"? Pro-social is defined as "things I think are good", and anti-social is defined as "things I think are bad". Surely you agree that charging enemy American machine guns, if you're the Taliban, is antisocial.