People in the west are taught white supremacism from birth, they don't use that name for it, but that is what it is, that the west is more "developed" more "learned" than the rest of the world, and that your average westerner is inherently superior to all others and is more knowledgeable. If you push your way out of this mindset you are ostracised and alienated, to a more extreme degree than one is ostracised for being a "leftist" so you get a lot of western "leftists" who still have a massive amount of white supremacist brainworms.