Leave out the "wrong type of people" part and you got pretty much every criticism ever. Bad movies, bad books, bad food...
The thing is, I don't believe McMansion owners need our pity. They're clearly well off and not afraid to show it. Speaking of "elitism", I'm pretty sure the author of the McMansion blog is poorer than any of the reviewed houses' owners. It's not like we're making fun of homeless people for having dirty clothes. Plus those damn houses are visible, they're part of our environment and not something you do for fun in your hobby room.
I can't get myself to feel sorry, even though I can understand a general opposition against "calling out" private individuals so publicly on the internet.