I think it comes down to fear, envy or jealousy. For example I’ve noticed a lot of (rich) folks in Hong Kong hate the “mainlandâ€Chinese because they’re so rich.
Then in Vietnam there is a strong anti-China sentiment because of the tenuous relationship with China colonizing Vietnam for so long.
And the Koreans hate the Chinese (the slur is to call a Chinese person a “짱께â€to perhaps mock their language) because China is the powerful dominant country (ì¤‘êµ literally means “center countryâ€), and also because Koreans want to build their own distinct culture (even though Confucianism and many scholarly traditions are adopted or borrowed from the Chinese).
Americans are anti-China because America sees China as an economic threat. I don’t fear World War 3 because in fact, the future warfare will be an economic one, not a bloody one. Also a war based on ideology.
Morale of the story:
I’m not afraid of China. In fact, I admire their brazenness, their “lack of standard moralityâ€, and their long-term vision.