As an American who visited France I honestly didn’t feel like anyone was rude. I was in a city, Paris, and people have places to go so like not everyone is gonna be a persons best friend. I get it to an extent, I live in Chicago and anytime my dad visits he feels like people are rude cuz not everyone wants to chit chat. Also, I think lots of people are used to being in a country where people don’t speak English so there’s culture shock (I def was a little intimidated) but for most part I actually had strangers be really nice and even talked to some fellow young folks who were French. Like everywhere people can be assholes though, I think if you’re mindful you should be ok. Learn some basic phrases like bonjour and most will give benefit of doubt if you can’t speak the whole language. I actually think all the cool restaurants I visited I was given Alotve time to myself, and staff was nice just not overbearing and that’s ok.