I differ from many modernists in such view. They think racism has to do with religion, culture, etc. That is only superficial.
The chief reason of racism: The belief that all races/nations' ancestry are "monkeys" (non-humans). So, some evolved "monkeys" think themselves better evolved than other types of "monkeys".
The fake cure for racism: ignorance.
The true cure for racism: the belief that all races/nations' ancestry is human.
The latter cure is ironically but contrarily used by the modernists as well. The modernists know this is the best cure, hence their motto "all are equal", but they conflict themselves with their evolution theory of man. This results in the extremes among them, from Hitler to those who think humans are equal with animals - they should all have voting rights, etc.
"But Noah is not real", some say. "It's illogical". Such are the utterance of ignorance. Basically, "How can one produce both black and white?" so claimed the uni-directional thinking but so called "scientifically minded".