According to “Master of the Mesorah, the Rishonim”, Rashi although born in France, learned in Germany under his illustrious Rabbeim before returning to France. He likely was fluent in whatever language the Jews there spoke. If Yiddish was the “street language” for all Jews though (and none made it to eastern europe yet, the ashkenazi yidden lived in ashkenaz, and west into france not poland, hungary or galicia), why did Rashi use old French words when trying to explain something and not Yiddish, the hamon am that his pirush was for, would have understood what he meant.
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