Where do you see desrimination? There are certain ethnic and racial stereotypes that are widely used by the media and I don't think that exploring them is racist - that is, if you avoid insulting generalizations. I hope you will agree with me that changes in race may lead to changes in social status (and if the story takes place in the not-so-distant past, they must lead to them). Or do think that a racist is someone who uses racial relations as a driving force of a story?