Since 150k is obviously not median income for a family of 4, one of two things is correct.
This posters definition of middle class is highly warped. He or she is conflating icons of middle class life with those of upper middle or upper class.
Lots of people, enough to constitude the middle, have been living beyond their means to emulate an income of 150k.
At some level both are probably true, but it remains to be seen which gives out more, lowered expectations of what it means to be middle class, or the demand destruction from forced deleveraging.
