I'm French and I read this book because an American friend lent it to me. I spent a lot of time in the US where I studied and worked and it took me a lot of time to understand why I felt so lost in this country just like most Americans feel upon moving to France. I just felt Americans were so welcoming but at the same time seemed so rude to me. Obviously I was the one who should try to understand and adapt and after a while and some introspection things went very well.
I was first intrigued by this story but I enjoyed reading it. However, you should know this book isn't to be taken too seriously. It made me laugh because I could recognize typical French reactions to what we see as rude and arrogant British behavior. But everyone wouldn't act like that although at times I would have done the same because the character deserved it for being such an ass. He unconsciously realizes he is not going anywhere acting like that and gradually adapts to the French way of life. For sure, French are never going to change because foreigner don't understand them, which is quite normal after all, even if they should sometimes. In fact what is striking about the relationship between French and Brits or Americans is how much everything looks the same on the surface but is different underneath, in the details. Obviously one has to concede the character isn't trying his best to adapt to the codes and, unfortunately, gets what you would expect a (stereotypical) Frenchman would do to a foreigner acting that way: a revenge for not trying to act French in the form of rudeness and aggressivity. So if that book seems to illustrate your feeling about your last trip to France try to read a few tips on how to get the best of French people. Here are mine: be polite, not intrusive, and say it when something is wrong... French people also hate it when a waiter or store clerk is rude, they just go to another café or store or if they can't, they put up with it with a "C'est la vie" (It is life). French people will suffer the same hardships, they are just brought up to suffer them philosophically. There are some things that can be shocking to Americans. It is indeed OK to talk about sex, but slippery to talk about money. Well, that's just the way we are, it doesn't mean you HAVE TO talk about sex. French people will correct your pronounciation, but don't be mad at them, they just want to help you become more French. If they make you mad they'd probably make another Frenchman even more mad. French people can be really generous and welcoming provided they don't see you as the "Ugly American" or Briton and it doesn't take a lot: don't talk overly loud and when they offer wine don't ask for a coke. Everybody drinks coke in France, just not with their cheese. In a word, do not refuse to taste their culture. That's supposedly the reason of your trip. Although not everything is correct or accurate in this book, most is BUT you shouldn't take everything too literally. Most of the characters or the situations have been exaggerated a bit so as to make it more funny.
Enjoy it, it's a fun book and will definitely show you how bad it can get, but don't form an opinion about France based only on this book. It doesn't have to be that bad.