What do you think about racism?

I think that, by the scientific viewpoint, racism is a nonsense because there aren't superior and inferior races. Racism is the worst and the most disgusting lie in the world. I live in Italia, I can't stand the nonsenses of some racist Italians when speak against gipsies, Muslims or gays. There is a lot of stupidity in their words, they are frightened by these persons, and their fear gives birth to racism.