Just returned from 10 days in Paris and had prepared myself to experience some of that French rudeness I kept hearing about. Well, I'm happy to report....it's all just a big myth (maybe started by francophiles by me who want to keep too many tourists from overrunning the country!).
I know very little french....but smiled, was polite, said bon jour and merci. The few times I tried to order food in french, the waiters, kindly laughed and repeated it in English...or one fellow just said, "What?" and we both laughed. Everyone was kind, helpful, and friendly.
In fact the only person who was rude to me (an American in Paris), was a woman on the subway who hated America and criticized me for visiting France and not knowing the language better (she tried having a conversation with me). And, as it turns out, she wasn't even french, but from Peru.
Anyways...any of you Americans out there feeling a little worried about how you'll be received in Paris, don't worry. The french and the americans have a long history of friendship.....and from what I saw, it's still going strong!