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While I'm sure you knew to say please and thank you, and at least try to use their language, you also can't really deny some of your countrymen have given you a poor reputation. It's come to the point that your reputation is so bad, the common advice is to impersonate Canadians.

Were the Parisiens wrong to be rude? Probably. Could they have simply learned from other Americans that being rude is the default? I would assume so. I'm not saying it's your fault, just that it can be easier to assume the next Americans will be as loud and obnoxious as the last ones.