(CBS) Conventional wisdom, history and present on-field results point to first-year Cubs manager Joe Maddon as doing a fine job in the Chicago dugout and being an upgrade over an assembly line of underwhelming skippers of the past decade to man the home dugout at Wrigley Field.

Apparently, though, anyone could do the job just as well — at least according to a Boers and Bernstein Show caller on Thursday afternoon.

A man calling himself John from Palos Hills dialed in to stump for former Cubs manager Rick Renteria. It started out innocently enough.

“As a Cubs fan, I think Renteria got screwed,” John said.

Fair enough. Renteria was fired last fall after being forced to trot out overmatched journeymen for the first half of the season and then young talent that wasn’t ready to compete later. Renteria did what he needed to do, nurturing that young talent and helping Starlin Castro and Anthony Rizzo become All-Stars in 2014. The Cubs went 73-89 in his lone season as manager.

What happened next in the call had co-host Dan Bernstein incredulous. For good reason — the caller went off the rails.

“He could’ve had a chance for greatness with a young team and build his reputation,” John said of Renteria.

“I don’t see any rings on Maddon’s fingers, and the White Sox gave Ozzie Guillen a couple years (to grow) and he got a ring within a couple years.

“How many rings does Maddon have with Tampa Bay? How do you know (who’s the better manager)? You didn’t give Renteria a chance.

“I don’t think the Cubs’ record would be any different if Renteria was the manager now.”

It’s worth noting this scorching take came one day after Maddon pulled the right string on multiple occasions in a rally from down five runs in Cincinnati. He yanked starter Dallas Beeler in the third inning and pinch hit Kris Bryant, who followed with a two-run single. In the ninth, Maddon pinch hit light-hitting backup catcher Taylor Teagarden against the hard-throwing Aroldis Chapman, and he came through with the winning hit.

Listen to the full call below if you need some entertainment.