"there are lots of yuppies who want to defend their housing prices who might be liberal but I don't associate this position with leftism in any way"
People tend to call the Democrats the left, as they're at least somewhat leftward of the Republicans. It's at least easier for discussion purposes than speaking of the right and the other right.
Yeah, I get it. But we also use liberal and I think in this particular case its worth drawing the distinction between these two "camps" of the democratic party.