Why is it if members of a certain race excel beyond human capacity members of the other race send death threat?

Racists say were stupid, and we should be like the asians.........when we do good they get angry because it proves were not stupid like they want us to be. Slaves back then were never given a education so yea they sounded stupid and it gave racists proof we are which is not true. I don't get it either...racists do have a lower IQ then non racists...studies prove so.