Gentrification is not something that people do because they're racist. It's also not the sort of thing you can hold one individual responsible for, it's only problematic when it reaches a tipping point. That's why the solution is collective protections, not just expecting people to stay in their "own" neighborhoods and reinforce traditional segregation of housing.
And I say this as someone whose home neighborhood was gentrified entirely out of existence. I lived through that, I know what it's like. We bought my childhood home for $11,000 because we couldn't afford anything better, and now it's worth a half million bevause they bulldozed the neighborhood and built a hipster paradise around it.
