Bullshit.
Many (most) economists judge that we are the richest country that has ever existed on planet Earth...and yet we still have poverty and privation prevailing. There are HARD WORKING people who have to work two and three jobs to get by. And there is the scum of the American right who laugh it off and claim it is because of laziness. They would destroy safety net programs in order to avoid having someone get dregs without working...as though the kinds of benefits to society that would accrue from those people being forced (allowed) to work are negative.
SOCIALISM, by the way, HAS LED TO THE SECOND (SOON TO BE FIRST) STRONGEST, MOST ROBUST ECONOMIES ON THE PLANET.
The wealth disparity between the US an China is not significantly different; nor are the poverty levels in the two countries. But China, which has recently had a spurt of growth so is still learning how to deal with that problem, has much more in the way of safety net programs.