This is true, but we're talking SF & LA here, metropolitan areas. Blaricum is better compared to something like the Hamptons. There is no public transport because there's space to park cars, so public transportation is not necessary and it's impractical since the population is spread out.

The Apollobuurt in Amsterdam is also full of rich people and yet there's a lot of public transportation. The people living there are not against public transportation though.