wtf is up with drunks in bars

ok so i went into a bar last night for the 2nd time in my life and there was a drunk guy of average size about 5'9 175-180lbs, he was a bit drunk i could see and he just walks up to this guy 6 foot 5+ and about 300lbs about the same build as antonio "bigfoot" silva, the guy stands in the big guys face and mutters something i couldnt hear and then looks pissed and says "you're not that big to be leaving here like that", Then the big guy just turns his back and the guy stands there for a minute and says "you ever been mugged?" to the big guy. The big guy keeps ignoring him and the little guy says "well **** you then ya cunt be a little panzy". The big guy just ignored him still and the average guy stood there 5 more minutes staring and finally just walked away. What the **** is up with drunk *******s?.