Because you're listening to a TV show. I would have thought by now, people not in the U.S. on this site would realize anything on TV depicting us is usually negative towards us.
I'm don't judge the U.K. based off your comedies or Top Gear. Otherwise, I'd think you'd all have an almost out-there taste in humour, or have nothing to show but being a jackass.
But I don't, so I don't see why you should be judging the U.S. from what you see on our TV shows. Hell, I was in France once, and some people there thought everyone in Dallas had money and oil.