There are racists everywhere that's true, but people who are naturally racist are rare because racism is something that is taught. The lack of a strong voice for minority races is what allows racists in power to normalize their discrimination against them, eventually making it a systemic and widespread phenomenon.

You argue that the opium epidemic has absolutely zero effect on racism towards Chinese people. However I say that the opium epidemic directly started a chain of events that led to the downfall of the Chinese government, which enabled racist people to teach their racism to the government and the rest of society without fear of repercussions, therefore enabling widespread and systemic racism against Asians.