Except that racism isn’t just a mean remark, racism is the social and institutional oppression of a group of people such that authority itself is bent to subordinate them and deny them the basic tools to protect themselves or advance in society. As much as many East Asian cultures may have xenophobic tendencies, they have not enslaved white people, manipulated the law to incarcerate them en made them force them to perform labor virtually without compensation, or denied them basic services such as access to restaurants and swimming pools.
Dave may have been the subject of prejudice (and I’m sorry to hear that happened to you), but he was not the victim of racism.