There will always be cultural differences and similarities between different nations and, even regions within a country. Look at how this comes out in different threads on GN where something one region of Britain takes as commonplace is unknown to someone in another region of the country.
In Europe, we have a common Western European Christian tradition that has shaped us and given us things in common for nearly 2,000 years, then we have all the differences that arise from people living in smaller areas.
We famously have Magna Carta and have had a representative government since 1215. Universal suffrage is much more recent but from 1215, our monarchs have, at least nominally, had to answer for their actions to the houses of parliament. This has diffused dissent, but we have had our revolutions, campaigns and riots on our way to the current situation.
France was governed by an autocratic monarchy with no reportability until it was finally overthrew it violently in 1789. Since then it has had a turbulent, history of monarchs and republics, it is now on its 5th Republic.
If after the 1789 revolution, France has settled for an unchanging republican democracy, then it probably wouldn't have riots like they do, but having done it once to effect change in 1789 and done it regularly since, rioting for change is embedded in their psyche.
After 32 years of owning property in France, We have probably lived in France for the equivalent of 3 years, I do not see any real difference in individual personality in people.
If Suedonim's DiL, is direct, it may well just be her natural personality. I can think of a lot of people in the UK who have those characteristics. I can think of members of GN whose posts suggest that they have those characteristics.
Every nation has aspects of its life where its occupants have expectations and complain quickly when they aren't met. They just differ from country to country.