As others have posted, once you get outside Paris, you'll get a much warmer reception.
A while back, I read an account from an American that was repeatedly greeted by elderly women in the South of France. Some were on the edge of tears.
Apparently, they were old enough to remember who liberated them from the Nazi's.
I seriously never knew that. My two kids take French.. both their teachers stated the French aren’t “warm” to Americans. I have to say I just love the story about the elderly woman in the South of France. That is just beautiful. :)