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Jeff Bhasker, who produced tracks for Beyonce, has laid into her Destiny's Child mate.
Bey's producer described Kelly Rowland's new song with Lil Wayne as "weak" and "horrid" during a rant on Twitter.
"How can this kr song with the weakest beat and melody of all time be the #1 song on urban!?" Jeff posted.
"Oh yeah. Wayne."
The new X Factor judge's track 'Motivation' hit the top spot on the Billboard Hip Hop and R&B charts in the US earlier this year.
But Jeff, who helped make Beyonce's album '4', continued to lay into Kelly's hit.
"I just listened to Motivation again to see if I was too harsh in my critique," he added.
"I wasn't. The lyrics are horrid as well."