Derrick Lewis put on a good show against Junior dos Santos at UFC Wichita last Saturday, but ‘The Black Beast’ was unable to handle dos Santos’ knockout power.

Lewis, who was reportedly suffering with a serious knee injury heading into the bout, was knocked out in the second round of the UFC Fight Night 146 main event.

As is par the course for many UFC fighters, Lewis has been criticized by online trolls - and head coach Bob Perez isn’t too happy about it.

Speaking to MMA Fighting on Monday, Perez grilled the online trolls and ‘morbidly obese’ reporters for criticising Lewis’ performance, calling Lewis’ critics ‘haters’ and ‘f-cking idiots.’

“All these trolls and all these haters and all these f*cking idiots — Derrick sucks? Come fight him, see how that goes for you, dumbass,” Perez said. “These reporters that have never competed in anything other than a pie-eating contest, they’re having trouble breathing while they’re f*cking typing because they’re morbidly obese, they want to question Derrick about his f*cking cardio? F*ck you.

“We’ve had a couple of guys show up to the gym thinking they could beat Derrick in a fight and they got slept, bro. They got slept. People just don’t get how hard this is, how hard it is on the fighter, what they have to do in preparation. The aches, the pains, the heartache, the blood, sweat and tears — the cliche stuff. It’s f*cking true, man. These guys go through so much and these fans are just the most wishy-washy flip-flopping — they’re worse then politicians, man. You’re winning and it’s ‘We love you, you’re the best, your balls are hot, you’re the Black Beast.’ And you lose, ‘Aw, f*ck you, you suck!’ These fans, they’re f*cking terrible, man.”

Lewis has slipped down two places in the heavyweight rankings since losing to dos Santos and finds himself on a two-fight losing skid for the first time in his career.