Levittown was hated by the liberals because it allowed the "little people" to leave the tenements and move out into the suburbs they wanted for themselves. They never got over the prosperity of the 1920s, and were dismayed that "ordinary people" could start to afford their own cars, and houses. Liberals intended the lower classes to remain in the city (preferrably in government housing), and take mass transit to their city-oriented jobs. The Great Depression and World War II stopped economic growth for the "little people", and liberals got to thinking that was the natural state of things.
Liberals are elitists who want to slam the door on everyone below them, and then dictate how the underclass should live. A Volvo or a SUV is their natural right, but if you or I buy one, ours destroys the planet, while the liberal's doesn't.
And if you notice, I'm using a lot of "liberals are...". And it fits!.