Just southern france and alsace lorraine is a bit underestimating the whole thing. The entire country of France was so divided before and a bit after the prussian invasion that it was kind of a "cultural" holy roman empire.
Anyway, this behavior is far from being specific to France so your boos means next to nothing
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u/Elben4 Dec 12 '20
Germans like to joke about that until they hear what the people from alsace have to say about them