Causing trouble is actually very simple. Just get drunk and then pick someone you don't like, tease them a bit, and you'll probably start a fight. Bars are like this; a few drinks, and everyone starts to feel like they're the toughest person in the world.
Actually, those who are most likely to fight in bars are usually the down-and-outs. No offense to them, but a bona fide Gao Fushuai doesn't need to fight with you. If by accident he got killed, he'd be at a loss; if by accident he killed you, unless he has a strong family background, he might have to spend a few years in jail, or even worse, end up dead with you.
So, most people think their lives are valuable and it's not worth clashing with those who get drunk on booze and cause trouble.
Therefore, those who fight after drinking cheap booze are generally the down-and-outs whose lives aren't worth much. They're oppressed by their bosses, earn little, and drink to vent their emotions.
