If you go to the French countryside and of the regular path in Paris, and say Merci and s’il vous plait, and ask them to just decide for you what lunch to eat and smile, you would see a difference.
The Germans are nice to Americans, and when they have to endure our terrible driving, butchering of their language and snobbiness, they talk about us behind our backs. The French just like to be snobby back to us on the spot.
I have never been to the Eiffel Tower and I avoid Notre Dame, and the Louvre.
There ARE other places to go where the locals are not burnt out on pushy Americans and where they are very happy to see us being slightly curious about what makes France interesting.
I spent 10 of my 20 years in the Army stationed in Germany. I know a little about how Germans feel about us. My vote would say 90% of them hated us. They were glad we were keeping the Soviets out, but would rather we had done it from the eastern side of the wall, not the western side. They wanted us out. WE were a reminder of their stupidity of Hitler, and losing the war to what they felt were inferior peoples.