Even though he was at least buzzed from the alc, the dude threw some precise, fast and heavy punches at those poor dudes.
Also to the posters mentioning that the guys had glass chins in the video. They did not expect a punch and did not react to it by moving out of the way, probably a bunch of gay dudes as aforementioned who have never been in a real fight before.
As the gay community would put it, the brawler was the bear in the relationship, probably pissed off b/c his boyfriend cheated on him.