Numbers about "inequality and stagnation" can also be miss leading as well as every study I've seen as it fails to take in account people who change classes (IE a poor person who becomes middle class etc) as it happens all the time.
It also fails to account for the price of progress and technology. Things that were only for the upper class years ago can be seen carried by the poorest of people. Homes are bigger today, cars are nicer, there are things like computers and iphones that didn't exist 40 years ago etc.
Big fan of Russ Roberts - he goes into
more detail here.