Daniel Hertz sees no way for the well-off to avoid it:
Whether or not you say “hi” to your neighbors, your presence in a relatively low-income or blue-collar community will, in fact, make it easier for other college graduates to move in; to open businesses that cater to you; to induce landlords to renovate or redevelop their properties to attract other new, wealthier residents who want access to those businesses. If your city restricts housing supply (it does) and doesn’t have smart rent control policies (it almost certainly doesn’t), you’ve ultimately helped create an economically segregated neighborhood.
But it’s worse than that: it doesn’t even matter where you live.
Moving to a higher-income neighborhood – one where market and regulatory forces have already pushed out the low-income – means you’re helping to sustain the high cost of living there, and therefore helping to keep the area segregated. You’re also forcing lower-income college graduates to move to more economically marginal areas, where they in turn will push out people with even less purchasing power. You can’t escape the role you play in displacement any more than a white person can escape their whiteness, because those are both subject to systemic processes that have created your relevant status and assigned its consequences. Among the classes, there is no division between “gentrifiers” and “non-gentrifiers.” If you live in a city, you don’t get to opt out.