Aldo,
Not to restart the Hundred Years War but I am the first to recognize the issue that a sadly large number of Americans (mostly unknowingly) are a perfect fit for the "Ugly American" stereotypes. Thinking that everyone everywhere should speak english and that american cuisine should be ubiquitously available is a problem and deprives them of the full cultural experience they paid for.
That said, and my being particular sensitive to this after many years of working with European business partners and many European business trips, the fact exists that the French speaking people of the world do have a higher degree to parochialism towards their mother tongue that any other bunch I have met.
Normally when you give saying something in the local tongue a "college try", most foreigners will laugh at your pronunciation, give you an A for effort and try their best to speak in English or pass you off to someone who does. You have won their friendship through your attitude the "yes, I'm not good at this, but I respect you enough to try".
I'll never forget the time 20 years ago in Paris when I asked a cab driver to take us to the Rodin museum, completely butchered the pronunciation. He feigned ignorance and made me repeat it about 5 times. Finally said "ah Rodin, you Americans just cannot learn our language" with a real condescending attitude. Completely ticked at this point, I told him his language would be German if it wasn't for Americans...that he understood perfectly well the first time and shut up. Of course, that was wrong to say and I should have held my temper, but it was effective too.
If someone goes halfway, go the other half...we're all in this together...
John Faeth