DUMB ARREST
Arizona cops were so befuddled by Cameron Payne's insistence on giving them a fake name during his arrest earlier this year ... they actually called the NBA player and his decisions "dumb" -- new police video, obtained by TMZ Sports, shows.
The arrest went down at Payne's Scottsdale residence at around 2:30 AM on June 14 ... after cops jetted over to speak with the 30-year-old New York Knicks guard following claims that he was in a verbal dispute with his girlfriend.
The Scottsdale Police Department body cam video shows once cops arrived on the scene .