More comments?

As a human society,we had to go from caveman into what we are today.My question is this:if we (as humans) could work long enough together to create language(s) to communicate with each other,how did we,as a whole of humanity,decide what insulting words belong? Is this a sense of one person deciding another person is different,and therefore doesn't belong? Yahoo kicked the last question off,let's try this again.