People calling us nicknames does not affect us is a way of trying to act like they do not. We are affected by people not liking us, what we do. Whether we accept it or not, we feel down, grow a harder pair and a stronger protective mechanism to protect our ego. This is our nature. After some point of abusement, some people start attacking others and calling them names to prevent this fact and try to focus on how artificially strong and cool they are to be able to bully around other people. At the end of the day we are such helpless creatures in front of real powerful events and beings that everything loses meaning when we face real danger and power that our social cosmos' rules cannot protect us any longer.
I post, therefore I am.