It's mostly because Germany dominates the discourse, and the impression of outsiders towards the EU. Sure, Germany, Austria, Scandinavia, Netherlands and Belgium are miles ahead of the rest of the EU, but the rot begins once you go south. France, Italy, Spain, etc. are so much worse places with the rest of the EU following in the slow decline. Meanwhile, other places such as Poland and Hungary with rising living standards are turning into ultra-conservative shit holes (to speak broadly. Of course, the story in the cities is usually different).