I think a lot of us need to admit that the author is right. I, for one, do generalize about Europe. I think of social democracies with high taxes. I think of arcane rules and regulations to start and run a business. And most of all, I limit the term "Europe" to include about 20 of the 50 European countries. I will never think of Russia as a European country. If I entered a contest and won a vacation to "Europe" - and the destination turned out to be Albania - I'd be thinking "Wat?!? That's not Europe."
From the outside, the term "Europe" is a confusing morass of distinctions. There's Europe, the Eurozone, the EU. The UN also has a geoscheme that is different than all three of those. Hell, half of Americans probably don't know the difference between England, Great Britain, and the United Kingdom.