I am a French speaking Québécois and do work with many French people (downtown Montreal). You can't deny that the French French and Québécois French uses a lot of different words. They are still the same language for sure, but we often have so much fun exchanging funny expressions.

A funny anecdote was when I was working with a guy name Jean-Nicolas and all the Québécois people called him Jean-Nic. That was very funny to the French guys hehe

Not a native French speaker, no. Apologies if that one-sentence broad generalization was tiring to you - I meant neither to explain nor be exhaustive. ;)

Obviously they're not different languages - I was a bit exaggeratory in that regard. And I do understand both, in as much as I understand either. French is my third or fourth most proficient language after English, Spanish and maybe German, but I never get to use it (or German for that matter).

The two are however different enough in some pronunciation and idioms that we ultimately had to do a second localization to support both. And the differences reported to us ran the spectrum from simple things, such as how to correctly pronounce the (cardinal) number 1 (a cleaner "un" compared to what sounds to my ear like "arn"), to the longer phrases one might expect to hear in a voicemail prompt. Ultimately our translation department got things ironed out, but it was a (somewhat amusing/bemusing) learning experience for us.

It's ok.

I have another response in this thread about the origins of the Parisian accent (because it really is a new invention) compared to the Québec accent.

Also in Martinique, they speak with a less sing-songy accent than they do on the mainland.

I personally enjoy all the variations of my language, and especially appreciate the language that is 'of the people'.