This is just a wild guess.....
But, not to sound like a racist asshole, ...but I assume the gang members to be of minority backrounds. That may, or may not be "steriotypical" sorry,... but just an educated guess given the whole laughing at the guy thing. They seemed to really enjoy beating this guy.
I saw this "real tv" show once that had this Indian store owner gentleman, running out of his store, then this ...Black American individual clocks this guy straight in the face, laughed, proceeded to rob him, and then, whipped out his dick, and pissed on the beaten store owner's face! That takes balls. To say the least,... I was amazed. Shit like this makes me glad I live in a nice place. Criminals of that caliber deserve the fucking chair. Total waste of life, in my opinion. Complete and utter disreguard for others, and pose a serious physical threat to everyone around them.