Exactly wrong again. Smart Growth proponents advocate a MIX of income groups, ages, etc living together in neighborhoods. It is 1960-1970 zoning that segregaged neighborhoods by income and kept all commercial activity out of neighborhoods and made schools huge and far away from neighborhoods, rather than small neighborhood based schools. It prohibited small stores and service businesses such as hair cutters, dry cleaners, drugstores etc. from being inside the neighborhood. It outlawed connected streets between residential neighborhoods in an effort to keep the undesirables out. You've got the wrong people identified as snobs.
Smart Growth advocates a mix of housing types and price, schools, small service businesses, churches, etc. embedded in neighborhoods by design.
You really need to educate yourself about what Smart Growth is about. You don't have a clue.
Furthermore, the only lower income people who agree with Smart Growth are those who are afraid of inner city (read black/hispanic) immigrants trying to find affordable local housing so they can send their kids to our superior schools. So scorn my empirical opinion all you like--they walk like ducks, etc. If we have the wrong impression of Smart Growth, maybe they gave it to us.