I spent over ten years in Europe. France is much like the rest of Europe, some people are nice, some are rude. Americans traveling in Europe are the same.
American and Mexican food is easier to find these days than back in the day, but why bother. Even the Brits are putting out fine chow these days if you know how to find it. Indian, Indonesian, Hungarian, etc. places are generally very nice. Frogs and snails were put on this Earth for a purpose, the French have figured this out.
American cars have never sold well in Europe because of how Europeans tax their cars and their gasoline. Maneuvering a ‘63 Buick through medieval villages was never going to work. I’ve tried most of them: Peugeot, Audi, VW, BMV, Lotus. The Lotus was the best except for the mechanics bills.
LOL! When I was there in the 60s I had to depend on Italian restaurants and fish'n'chip shops for sustenance. In this century, it's the streetside fruit vendors, Starbucks, McDonalds, Nando's fast food, and the Turkish kebab shops. Had one spectacular meal at a gay-owned restaurant in London's theater district, though.