Yes, the median American family income is beaucoup high - problem is, actual people turn out to not be continuous intervals in the $cash dollars$ domain. There actually are a growing amount of people in this country living under increasingly shittier conditions. If you do not believe the words you are reading, then take a few weeks vacation for a road trip through Kentucky, Virginia, Pennsylvania, etc, and go through the random towns and talk to the rural population for yourself.

addendum - Our country is wildly diverse, probably moreso than even most Americans realize.