Cornered on the subway

I was on public transportation in the early afternoon, on my way home from work at the hospital. A male-presenting person in the same subway car as me got up from their seat and started screaming "ching chong" at me. They then pulled out their phone and started recording me as they continued to shout and advance closer. I did not feel safe engaging with the person, but I also did not want to report them to the transport police as I was worried about what would happen to them should police become involved. I tried to ignore them as best as I could until they eventually exited the subway.