You are genuinely retarded if you think that leftists were the ones who came up with the idea that racism was bad.

The reason why leftists said that racism by whites was bad and yet racism against whites is good is not related to the concept of racism being bad generally. The reason why leftists take this stance is because they want to erode the current power structures of society so that they can take over. It's not just about whites, it just seems like this because whites are the majority ethnicity in most of the world's most successful civilizations. Leftists can, will, and absolutely have done the same with other races in the civilizations where they're the majority, as can be seem with the attempted Leftists infiltrations into Japanese culture.