It was DeMarcus Cousins vs. everybody Monday night in Puerto Rico ... the ex-NBA star got into several altercations with fans, and things got so bad, Boogie had to be escorted out by police!
It all went down when Mets de Guaynabo -- the team Cousins joined in the Puerto Rico BSN League this year -- faced Bayamon at the Coliseo Ruben Rodriguez arena.
During a timeout, Cousins got into a heated exchange with a fan ... which seemed to start with the guy taunting Boogie by rubbing his eyes to simulate crying.