I totally understand the whole "McMansions are bad architecture" thing... However, something about it really bothers me. There was an episode of 99% Invisible where the guest was talking about their McMansions blog and how it makes fun of these Horrid dwellings. The whole thing stank of classist elitism. The Wrong Type of people were getting the chance to design and build large houses, and of course they're applying…
The person you're describing is a 23-year old woman who comes from a working-class background. Hardly elitist. McMansions are/were a status-symbol of the upper-middle class, and now they're being attacked from the bottom.
(Also worth noting that McMansions are typically homes to the upper middle class and the rich, not the poor.)