In the wake of the UFC being sold for $4 billion, Top Rank Boxing CEO Bob Arum decided to take the opportunity to criticize the UFC and it’s fighters for a string of failed drug tests.

Prior to the event, Jon Jones was pulled from the card for a potential USADA anti-doping violation, and after the event it was announced that Brock Lesnar failed a pre-fight drug test in June, as well as a fight night drug test the night of UFC 200. Arum also went as far as to accuse the UFC brass of being corrupt.

That didn’t sit too well with UFC President Dana White, who fired back at Arum via MMAJunkie:

“Does anyone give a (expletive) about Bob Arum or what he thinks? I didn’t know he was still alive!!?”

“I remember a bitter, fat, red, alcohol-abuse-faced Arum chirping about the ‘oodles of money the Fertittas were going to lose on the UFC,” White said. “Arum is the biggest dirtbag in all of sports. I look forward to sticking around and continuing to kick his ass in every aspect of our business.”