I think the truly toxic thing is people not spending money in their communities. One of the things I pick up from anti-gentrification stories is that when new people move in, the existing shops lose customers. No-one goes to the corner store, they get food via an app or wait for a Whole Foods to open.
The (completely unintended) effect of this is that the existing community gets poorer, not richer, when rich people move in.
The (completely unintended) effect of this is that the existing community gets poorer, not richer, when rich people move in.