He refuses to greet us because we are Asian

I am speaking for my mom. She reported that a doorman in our building discriminates against her and refuses to serve her like he serves others. He refuses to greet us because we are Asian but he greets other tenants normally. He refuses to get and return the cart in the building for us like he does for others. When I was not at home, my mom said he yelled at her and punched her package in a violent way. This guy is ruthless and we feel unsafe to stay in the building, where we have owned a unit since September.