If I move away from those areas, its white flight. If I move to those areas, its gentrification. How do I win this argument?
The article is about how we need to build more housing immediately, which would make everyone's CoL lower, everyone's lives better, and would also go a longgg way to resolving the exact tensions you describe.
The point about NIMBYs is that the key factor preventing us from building more housing is local opposition from people who are primarily concerned about protecting the value of their house so they can resell it later.
I've been a "gentrifier" in several places and never had any issues; its as simple as being thoughtful about your role in the community and respecting your new neighbors