Why do people get so angry when anyone says caucasian people are a superior people?

None seems to mind when people suggest blacks or asians are smarter or superior, but there seems to be a severe emotional reaction when it's caucasians, especially white. the only difference is the mounds of scientific and historical proof that caucasians are the smartest most innovative people. There ase always cries of bigot and racist regardless of the proof. This is a dangerous primitive response.