I don’t care if you see yourself as a Marxist or not. Your argumentation is founded in Marxism, whatever you realize it or not.

North Korean dictators do not discriminate against the poor because they are Korean

Really, the North Korean elite do not oppress the North Korean people, and discriminate against them with the treatment they receive compared to how the rest of us are treated?

And what about the Khmer Rouge and Kapo?

Really? As opposed to actuallybeing oppressed?

No, as compared to being labeled as part of the oppressed. Being labeled as oppressed and being oppressed is not the same thing. But often being labeled as the oppressor, like for instance wearing glasses, can quickly be a reason to justify your oppression by your oppressors in your totalitarian framework.