Han supremacy? Laughably absurd. Just because some other cultures have a history of thinking they're better than everyone else doesn't mean that every culture does. Accounts of what China and the West thought of each other survive from the era of Marco Polo. The Chinese thought of Western Civilization with equality and respect. The West's opinion on the Chinese? Barbarians.
Every country has its bigots, but suggestions that a country that just came out of hundreds of years of institutional racism from the Qing and then the British opium wars has a deliberate agenda based on race supremacy just sound like projection to me.
Confront the mirror.