I think you really are missing the point, though. You may have found the comment entitled, but I don’t think there was anything fundamentally offensive about it

I think you really are missing the point, though. You may have found the comment entitled, but I don’t think there was anything fundamentally offensive about it, and your reaction reflects more about your discomfort with the existence of the upper middle class than it does about the actual topic under consideration. No one is asking you to feel sorry for them — they’re just illustrating a point about where money gets spent in the US economy. Dual income families are — and for decades have been — spending their extra second income on housing rather than the rest of the economy. The comment you’re referring to is therefore very relevant because it shows that trend in action. Housing — and other opportunities in life it enables, like access to schools, (real life) social networks, safety, etc. — supersedes everything else in importance for many families, so second incomes are just spent on what is ultimately a bidding war over housing.