Many people will tell you that Parisians are rude. I have never experienced that. If you are polite, they are polite. It's that simple.
The French learn English in school and do know the language, but if you ask them if they speak English they will more than likely reply, 'yes, a little'. They are not trying to put you off. It's just that they don't feel they speak it as well as you do. So give them a break...if you speak some French, use it. They will be pleased that you tried. Otherwise, speak English but slow it down a bit. We Americans tend to speak like a 33 album on a 45 setting.
Greetings and courtesy are very important. We saw zillions of rude tourists and some rude French. Don't add to the problem... We are all on this planet together, so let's try to be nice every chance we get!
French people quickly kiss you! According to areas, the number of kisses is different. In Paris: 4, and other areas in general is 2. Always on the cheeks!
Parisians are not nice at all to foreigners. To be honest they are terribly rude and unpolite. Be ware! You also can't speak other languages then French here :(