No one did anything.
One time I was walking my dog and a man started calling me “Stupid Chinese girl” unprovoked and started throwing his possessions at me. When I tried to leave, he followed me down the street and continued to shout at me. Then, he kicked my dog. Three people on the street watched, including a USPS mailman who I started to explain that I was afraid of a man who was pursuing me. No one did anything.