The Belgians? Famous for, um, their rampant aggression..
..and equally rampant appetite?
I suspect there’s some kind of inter-Francophonic rivalry thing going on here. The French generally have a pretty low opinion of the Belgiums, and my best guess is that this is the cultural equivalent of an English cartoonist portraying the Scots as teetotal purveyors of fine foods (pot, kettle, black, anyone?).