As for the contradiction, the USA has a history that is very much unique and not shared with other countries, and the painful consequences are still very much alive. You would need to see the reactions of people in, say, Asia, when you tell them they have to replace master/slave and blacklist with other terms. They basically do it out of politeness but they do not see the need for that.
[0] https://www.independent.co.uk/arts-entertainment/films/featu...
[1] https://en.wikipedia.org/wiki/Russia_and_Black_Lives_Matter