Interesting thoughts here, both from those with personal experience and from those looking on. I do feel the OP was a bit of a dig, but there can be a tiny bit of truth in it on occasions.
When we lived abroad, I had a job supporting families who had relocated to that country. Mainly to do with their children's education, and language learning, but also helping to set them up and make useful contacts. Those with the best attitude were those who regarded their new country as permanent, whether that was the case or not.
My advice was always that they would find things very different from the UK, neither better nor worse, just different. Every country does what works for them, there's not point in trying to compare or criticise, and the best way is to be accepting and to try to fit in. That doesn't mean not being interested in what goes on back home, neither does it mean rubbishing their ways while smugly shouting their new country is far superior.
Most Brits are neither arrogant nor scathing about their country of origin in real life. Maybe occasionally on GN there is a bit of exasperation shown, followed by accusations, but most posters live and let live, and don't set out to constantly find negatives.
Bon retour, Mamie!
Je languis pour la vie dans l'autre sens, mais telle est la nature humaine!