Be aware when you expose a new idea to a French

When you have a new idea, be sure that French people will find an argument (valuable or not) to contradict you.
I think that it comes from his need to show that he knows, and when he contradict you, people will see that he knows and this will fuel his arrogance.
You can imagine his face, when he find such an argument, it's like someone having found the holy graal.
But the problem of that story is that most of the time his argument is ridiculous, and concerns differents cases.
There is a collegue, i name “Mr No”, because for every idea i expose to him, the first word i hear is “No”,
brrrrrrrrrrrrrrrrrrrr, why ......