Try not to call or meet anyone during their lunch break 12 till 2pm – unless you have been invited for a lunch meeting.
Typical discussion topics do not include your wealth – showing off your wealth is considered bad taste.
French organisations are very hierarchical and communications across these lines can be a time consuming process, if you want to speak to the manager, speak to them directly.
Chewing gum in public is considered vulgar.
Keep your hands out of your pockets when in public.
Slapping an open palm over a closed fist is offensive to the French.
Snapping fingers is also considered offensive.
It is extremely bad manners to ask a French individual about his political leanings or how he voted. You can enquire however about the political system or public opinion about political leaders.
Do not criticize Napoleon, since he represents a part of the French spirit.
Refrain from using any standard conversation openers such as, ‘What do you do?’
Politeness is of the utmost importance to the French. An rudeness will not be easily forgotten or forgiven.