I am French (half) so I am allowed to say it: French people are grumpy.
No. Let me re-phrase it. Parisians are grumpy. And Parisian taxi drivers are rude & grumpy, it’s a well know fact! (says someone who always warns everyone about not making general statements)
If you ever take a taxi in Paris, don’t be surprised to see the following sign on the back of the passenger seat:
You’re right, it doesn’t bode well for making Parisian taxis kid-friendly!!!
In Paris, do like the Parisians. Take the metro.