I think it is cultural differences
Having worked with both Dutch and French people over many years..
The Dutch realise that not many people speak their language, accept the fact and get on with trading and working in a world where English is the generally accepted language of business
( I am not saying this for any other reason other than that it is a fact of business life)
The French , in greater part, do not accept this.
They take it as an affront to, a slight on, their own language
The French love their own language (as do I) but most ( esp the (aristocracy!) will never accept the fact that the English language has surpassed their own as the major language of business communciation.
They "know" their language is better .
There is also a touch of Anglophobia about it too.
As ever, the old Anglo-French love-hate relationship surfaces whenever the issue of "language" arises .
Sorry to say, I also feel the language issue is related to the French arrogance and obsession with their mother tongue.
They just feel it is affront to the French language to replace it, or in many cases, even add to it, with English.
Just an opinion formed over many years!!