Fans are urging McDonald's to reconsider a proposal to create a "McWhopper", a peace offering for charity offered by main rival, Burger King.
Burger King took out whole page adverts in some of America's leading newspapers to invite McDonald's to team up for a charity campaign which would see the specially created handburgers served from a pop-up restaurant.
The open letter read:
The event would be in honour of Peace One Day, a non-profit organisation campaigning to make 21 September an annual day of unity.
Burger King then explained the McWhopper concept:
McDonald's, however, seemed less than enamored with the idea, posting its rejection publicly on Facebook on Wednesday morning.
Fans of the food chain were not impressed with the "passive aggressive" reply and were quick to voice their disapproval: