Mostly white parents don't want "low-income" children in their Upper West Side school.
The most liberal new priest I knew [in The Episcopal Church, that's going some] was being assigned to an urban parish with which I was familiar. I told him he would enjoy it, as the congregation was mostly West Indian and that's a devout and faithful demographic in our tradition.
What was the response from this champion of the oppressed? A surprised and somewhat panicked, "What's a West Indian?"