Some fans posted insults on twitter, but others took more drastic measures including blowing up and burning Durant's old jersey.
One fan wasn't ready to get rid of his jersey though, he made a special alteration.
There was a similar reaction after Cleveland Cavaliers superstar LeBron James decided to take his talents to South Beach and play for the Miami Heat.
Regardless, the Golden State Warriors are easily the title favorites for next year. They will have a solid core featuring four of the best players in the NBA: Stephen Curry, Kevin Durant, Klay Thompson and Draymond Green.
Oklahoma City fans will get to look forward to the Russell Westbrook show next season. Westbrook put up INSANE numbers when Kevin Durant didn't play in past seasons and will likely pick up where he left off.