Why do people have such thin skins?
Do you realize that people have the right to be racist and can express that pretty much any way that want? It's completely legal.
You have the power to ignore ignorant comments. Their use of a word or statement can only matter to you if you value their opinion.
Grow a thicker skin. Human nature is derogatory - and legally they can call you whatever they want. Why on earth would you let it bother you? Grow up people.