It never happened. You're new here so maybe aren't familiar with Arthur's MO. He'll even stoop to making up a fictional character that spouts off his own personal ideology, which apparently now also includes (among other amusing things) that "Europeans don't like to work".
Of course, from other dealings with Arthur, we could say this theory could have been something he saw on a news channel in passing that he now believes without bothering to actually investigate.
The massively hilariously irony is that he can say something like "Europeans don't like to work", then when you call him out on making such a ridiculous generalisation, he'll accuse you of being a "self-righteous prig for whom everything is black and white".
It's all quite a to-do.