Call security. That's racist.
If I was in earshot of that my brother, I would be calling security straight away on your behalf. To save someone else the bother.
Swearing like that around kids is not allowed at games. Racist comments are not allowed.
I love the fact things have improved in that regard at AFL. People who give racist lip are kicked out. People who start fights are arrested.
I love the fact I barrack for a club where there is little of that. Fight incidents seem always to be started by Richmond, Collingwood or Essendon supporters in my experience.