Conor McGregor ain't exactly spewing venom -- he's complimenting the hell outta Cowboy Cerrone ... in what might be the NICEST press conference he's ever been in.
Not only did Conor arrive 15 minutes EARLY for the event (super unusual for McGregor) ... but when the opportunity presented itself to trash talk, he didn't launch the missiles he fired at guys like Khabib Nurmagomedov and Floyd Mayweather.
Instead, Conor praised Cowboy as a real accomplished fighter, a worthy opponent and an all-around good dude.