Racism at a Chinese American Festival

I was in a car, two people were walking past about 30 feet away, one of them, the woman, mimicked a stereotype face directed at me when she saw me; she put her front upper teeth over her lower lips to imitate bucked teeth. I have experienced racism in SF, CA in the past however this particular type has never happened to me. I knew exactly what she was trying to do, make fun of me and Chinese people in a way she knew how. This racism occurred last month while I was attending a Chinese American Festival in Marysville, California, a gold rush town and one of the oldest Chinatown's in California, on a day Chinese Americans were streaming in for the festival. What this situation told me whether blatant or in this case, a surreptitious gesture because there were no other people near me, racism is alive and has been elevated to socially acceptable. You think there is strength in numbers and security in urban areas in the Country but contrary to legislation recently enacted to make bullying illegal, Trump and his administration have made it acceptable to harass and inflict violence on folks who look different, again, like other American administrations succeeded in doing over the past 150 years of America's relatively short existence. I am angry and don't have the tools to respond to or combat vulgar uncouth behavior in our society. What do we do?