France is full of rules and that's what makes life so livable here...

Rule:
You can not 'have it your way' when it comes to food in France
The Burger King motto does not fly outside of the US. So don't, please don't bring your American mentality to the table in France.

Eat the food on the menu as it is prepared or don't order it. There is' no mayo on the side'. 'I want fries instead of rice' options. Respect how the food is prepared and served. If you have food allergies or other restrictions ( It seems to me these days, its every American), try to do some planning ahead of time, although I can tell you are going to have a rough time in France.