Nothing wrong with name calling, but bullying is a different matter.
Name calling has been going on since the dawn of time. If you don't like someone you start calling them names or insulting their differences, politicians and some ABers are past masters at this game.
No one can force anyone to like another individual, it is not against the law, although they are slowly making it so, judging by the various laws they introduce.
Some groups take full advantage over these laws, it is their way of holding some power over us e.g. "They can't call me this" or "they can't use that particular word, but I can". Until there is a 'level playing field' there will always be a large number of the indigenous population who will see this to be a little unfair, to put it mildly.