There's no moral grandstanding. Some people just think you shouldn't be able to be so rich. The reason you are is because the masses allow you the privilege. You might as well be graceful about it.
But usually it's something about how mixed use neighborhoods are better, or how someone on minimum wage can't afford to live on their own in a very expensive neighborhood. Ok, but those probably aren't the real reasons you're advocating for change. Just be direct.
Language that straightforward is surprisingly hard to find among the YIMBY croud.