I would also recommend not being too loud, French people usually are pretty quiet in restaurants or public spaces, and being loud is frowned upon.
It's not just French people. American tourists have a reputation in many countries for being annoyingly loud.
The teacher sometimes asked the children were to "use their one metre voice".
It was a great atmosphere, but I was glad when the waiter asked us to swap tables to the other room — he rearranged all the noisy people into one room, and the quiet ones into the other.
Sounds like you might need to try some restaurants in the US. It's more than McDonald's and TGI Fridays.