Any person, regardless of sex, sexual orientation, race, ethnicity, blah-blah-blah, who incessantly berates a total stranger for no reason will encounter one of an extremely wide range of totally unpredictable responses, from total pacific indifference to violent murder. That guy drunkenly took a huge risk and it didn't quite work out too well for him.
That being said, assault and battery charges are warranted. Also, that's an extremely rare occurrence in the U.S. Racism is one of the least important "issues" in the U.S. today, in contrast to the Democrat Party Cabal's persistent, deliberate race-baiting lies about it. I'd say the rapid escalation of Marxism-Communism is the #1 problem in America in 2020, even though Democrats say it's totally nonexistent. So, racism is maybe #197 on the list of the country's most pressing problems. It therefore can be safely ignored and will continue gradually fading away as time moves on.
It’s rare to see a white man beatdown a black man because any white man would know the consequences socially and legally. Knowing that, is it sound reasoning to assume that blacks commit violent acts againsts whites with seeming impunity because they don’t see any serious consequences?