Lol dave. My wife is known as Brummie Mummy by our sons, as she attended Bromsgrove High school for Girls. She wasx actually born in Greenford Middx but moved to Halesowen.
Funny how national nicknames seem to revolve around food. Rosbif, frog, kraut, limey. I never minded being called a rosbif or a Brit and once I'd explained why 'frog' was used to describe them my non-English-speaking French friends thought it was funny. Depends how it's used and who is using it.
Any countries being annexed? Any countries being invaded? Any countries threatened with invasion? Any governmental persecution of minorities? Any wholesale disregard for their own constitution? You get the gist...