I totally get what you're saying about your perception of the "old country" being tainted by your newly adopted country Bit. However in my case, I had started to become disillusioned with aspects of the UK many years before I left it. And I think there is a difference between the way each country's respective medias portray the other country. For example, you're totally right about the UK media's biased portrayal of the US. There is a snobby anti-Americanism prevalent in much of Europe, and I have to deal with it from my friends all the time, most of whom have never set foot in the US let alone lived here and seem to have built their entire opinion of it from movies, the BBC and Guardian editorials.
As an example, a frequent opinion I hear expressed from friends is "I would never want to go to the US, I wouldn't feel safe, it's so violent." And then the very same people are jetting off to Brazil, with 4x the murder rate of the US, or Jamaica, with 10x the murder rate of US. They come back and they can't wait to tell everyone what a paradise it was and how they would move there given half the chance. Personally, despite the relatively high murder rate of the US compared to the UK, I feel safer walking around New York than I ever did in Newcastle, in which I saw
far more violence. I was the victim of violence many times back home simply crossing paths with some random drunks in the street who were looking for a fight, and whereas I'm sure that goes on here too I just see it a lot less. I can count on one hand the number of street fights I've seen in NYC in almost 15 years (seriously), whereas I would see mindless violence on almost a daily basis in Newcastle.
Now let's move onto the way Europe is portrayed by the US media - I have to say, it's almost on the point of being
fetishized. There is this meme in the media that Europe is a better, more civilized place where everyone is well educated and healthy and happy. Especially when it comes to Scandinavia (which has one of the largest rates of antidepressant prescription in the developed world). The editorials I read about Scandinavia are bordering on ridiculous, and I have both a Norwegian and a Swedish friend (one here, one back in Newcastle) who find them funny. My Norwegian friend, when asked about how great Norway is by people who have read glistening write ups about it in the US media, just laughs and says "it is not so good. You live there, you find out for yourself." Beautiful place of course, but just not the social wonderland it's portrayed to be.
And yes I'm speaking as a New Yorker, but the thing about that is New York is a melting pot - not just of nationalities but Americans too. I regularly meet, talk to and do business with people from all over the US - Arizona, Oklahoma, LA, Ohio, Kentucky, everywhere - so I've had personal experience with a wide range of Americans. While it's impossible to generalize too much, you do start to discern a common thread. That's not to say that certain things don't annoy me, of course they do. The weirdest things annoy me that are frankly so petty I won't even go into them