I have certainly been told at the accueil in shops in France that everyone lies. Been given suspicious looks when I have said I was being truthful, what with my little smile and look of hope, just to help the proceedings along you understand, and have often been given the benefit of the doubt. Which I should have been incidentally, as it goes against the grain to try it on.
It's true all these things are taught and/or simply picked up when children. That is why I always take all the bisous and bonschewer's with a pinch of salt, they are learned politesse and someone quite possibly could half run you over with a caddy if you are in their way, just after being ever so friendly.
I remember a very nice english bloke we used to know and would go skiing with. I soon picked up that to get on the ski lift, I had to keep moving forward, with wriggles and wiggles and a little shouldering too would help to get to that goal. I could be up and down a slope several times and he would only be half way down the queue, commenting how rude everyone was (me included).