American media project a depiction of life that is very attractive by design, and this raises expectations among consumers of this media. If Chinese people were not aware of the lifestyles of westerners, the Chinese government would be under less pressure to improve standards of living. And yes everyone in every country knows that popular culture depicts dreams and aspirations rather than reality, but even with this discounting of what people in the developing world see they become aware of the quality of life in the west.
This causes an expectations revolution that is putting tremendous pressure on the Chinese government, which is not necessarily a bad thing but can cause society to destabilize if growth stops.