"I love seeing a loudmouth get knocked out."
That's Justin Gaethje explaining why he LOVED watching Conor McGregor get knocked on his ass by Dustin Poirier at UFC 257 ... and man, he's reveling in the Irishman's defeat!
"I don’t feel bad for him," Gaethje told ESPN's Brett Okamoto ... "I’m happy for Poirier. I’m happy Poirier went out there and did his job and finished him."
"There is nothing that makes me happier. Seeing a piece of s*** get put down?