But the world is full of national and racial insults based on what people eat. Green dubs it "gastro-nationalism", and says it has "the benefit of several antagonistic worlds: not simply racial difference, but those ever-absorbing bones of contention, manners and taste".
The Racial Slur database lists hundreds of such terms, including "locust eaters" for Afghans, "salmon crunchers" for Alaskans, and "goulash-heads" for Hungarians.
American use of the word "limey" as shorthand for British is another example, referring to the eating of limes by British sailors who were anxious to avoid scurvy.