There must be a better word for this than 'nationalism'. After all, it was nationalism that drove my own country to fight for its independence, and establish a democratic government.
"To be a modern-day Chinese nationalist is to unknowingly agree to all of that and to become a de facto Han supremacist."
One of her friends married an English man, her parents excommunicated her, saying that she had "betrayed China".
I have heard of Chinese students in the UK unironically comparing black students to monkeys and questioning how they got in (since monkeys are stupid).
I would call it ethno-nationalism.
What you're describing could maybe be called ethnic hate/supremacism?