Well, sure, if you put enough tax pressure on the middle/upper-middle class, then that might have a counterbalancing effect of some sort, but generally speaking, the upper class aren't spending their money on things that people are worried about when they talk about inflation, so to the extent that it's "inflation-neutral," it'd be exactly the phenomenon people claim happens with inflation reporting today: "No, no, inflation didn't happen! See, rent and food and healthcare and education became more expensive, but luxury vehicles and McMansions are cheaper! For the overall basket of goods there was actually
deflation!"
Anyway, my point was rather to address the fact that the other commenter didn't seem to understand what "demand" means.