Except that she points out McMansions are shoddily built and won't last-- one of her photos shows a McMansion with especially severe water damage, for instance. Re-roofing that wackadoodle roofline is so cost-prohibitive you might as well just burn the thing and start over. If you ever have the money for "personal gratification", why not buy an actual mansion built with actual quality?
This is kind of splitting hairs. Obviously it's not smart to build something with shit quality that won't last.
To me, the biggest difference between a mansion and a McMansion isn't build quality, it's size. I probably won't have the money to build a place that's 10,000 sq. feet, nor would I want to. But 3500-5000 is feasible.