The first response seems to have been this post, which worked through the numbers and concluded that the household income in question was at least US$340,000 per year, and probably closer to US$450,000/year. Brad Delong linked to it, and then got called out, which resulted in a blog post for the ages. An excerpt (Brad has deleted names) Instead, Mr. Xxxx Xxxxxxxxx looks up. Of the 100 people richer than he is, fully ten have more than four times his income. And he knows of one person with 20 times his income. He knows who the really rich are, and they have ten times his income: They have not $450,000 a year. They have $4.5 million a year. And, to him, they are in a different world. And so he is sad. He and his wife deserve to be successful. And he knows people who are successful. But he is not one of them--widening income inequality over the past generation has excluded him from the rich who truly have money. And this makes him sad. And angry. And it turns out that Mr XXXX has a predecessor, from the turn of the last century. Paul Krugman got in on the act, with a couple of blog posts. And the whole thing is usefully contrasted with a link to John Scalzi's Being poor is... post. I looked it up - I'm damn near in the top 10% of income in Australia, and I don't feel rich. I needed the reality check.
The post that catalysed it all has been deleted from its original home, but was captured from Google cache. But the result is worth a look - a wide ranging discussion on how it is possible to make 9 times the US median income, and not feel rich.