Sorry, Sniffs, but it's simpler than that. Americans think hatchback = cheap because they're small and don't have big, torquey engines. They also dislike many of them simply because they didn't come from Detroit.
The reason why we're seeing a resurgence of hatchback popularity in this country today is because people are flocking to smaller, more-fuel-efficient, and "greener" cars due to the whole global warming scare and our "exorbitant" gas prices.