Most HN readers would be more than a little flummoxed at what "middle class" actually is in the US. The median household income is somewhere between $50-60k depending on where you look. The median individual income is a solid $15-20k less than that. And yet people will still nearly break their own spine trying to convolute a $200k cash comp tech worker as "middle class" because they happen to pay $4k/mo for a shared apartment in San Francisco.