Rihanna needs to work on her tardiness.

The 'Stay' singer was late for yet another concert, this time in Manchester, U.K. -- and the Brits didn't take lightly to her transgression -- and that fury led to a food fight.

During her heavily backing-track assisted intro performance of 'Rude Boy' on July 16, Rihanna addressed the crowd in her usual potty mouth manner (because the f-word is like, so rebellious and rock star).

"I love that s---," she said. "I knew you guys were gonna be crazy, but f---. This is next level," she gushed.

Then when her beloved Navy began throwing things onstage, she got sassy. "There's a good crazy and there's a bad crazy. When you throw s--- up here, that's an epic fail," she snapped.

Once she realized it was grub and not gifts making its way onto the stage, she got even more annoyed. "I swear to God, cut that s--- out. Really, chips? Chips though?!"

She does have a point. Considering how much she charges for tickets to her oft lackluster performances on her Diamonds world tour, her fans may want to quit wasting their food.