Floyd Mayweather and Manny Pacquiao would be wasting their time if they actually rematched their 2015 snooze fest ... 'cause boxing star Keith Thurman says not a damn soul wants to see it.
Thurman is Pacquiao's last opponent, having just lost a close decision to Manny last month. Some believe that victory for Pacman set up a potential mega-rematch with the Money Man.
Keith is NOT one of them ... when we got him out at Avra in Beverly Hills, he completely crapped on the idea of the two stars running it back.