The Chinese have been the worst in my own experience. I cannot really say much about the Japanese or Koreans.
According to the Bell Curve the Asians are to whites as whites are to blacks with respect to average intelligence. I can see where they obtain their arrogance.
Much of East Asia is composed of what Francis Fukuyama characterized as “no trust” societies. It’s basically what the Left wants to do here - a steady progression from a high trust, handshake deal society to a low trust and then to a no trust society. Easier to rule that way.