racists have universal contempt for people and cultures other than their own

Some racists may do, but most don't. Racists divide the world into their own race/ethnicity/culture and other races/ethnicities/cultures, and see other cultures as a threat to their own. Even the white South African government used to proclaim its respect and admiration for black culture - they just thought it was best if black and white cultures were kept separate (which is the meaning of the 'apart' in Apartheid).