Btw, isn't 'barbarian' actually comming from the old Greek version of 'makwerekwere'?
You have denigrationg words fost western Europeans (and several others) in French, and I guess this isn't the place to list them. I'd give just one, for 'fun'. Most French won't understand this, but you can find the word "frouze". It is not really rude, and is just a common slang word in the French part of Switzerland to design people from France.
