During a presentation at Cannes, Bono got onstage, sat next to Apple designer Jony Ive, and started to bash Apple's choice to keep their support for (Red) on the down-low.

Apple was one of earliest supporters of (Red), which looks to stop the spread of AIDS and HIV, launching a branded product program where tech fans could buy devices and give a little money to the charity.

But, according to AdWeek, Bono told the crowd that Apple has always downplayed its involvement, something the U2 frontman says began with Steve Jobs refusing to put the nonprofit's signature parentheses on any Apple products or in any Apple stores.

"One of the reasons it's such a credit to have Jony Ive on the stage is because Apple is so f-ing annoyingly quiet about the fact they've raised $75 million," Bono told the crowd. "Nobody knows!"

Bono then reportedly pulled out an official (Red) iPad cover and removed the device to show the audience that the logo was inside the cover and therefore always obscured by the tablet.