They aren't taking it in a literal sense, but you've seen increased wealth polarisation.
Looking at aggregate income, the lower income group decreased from 10 to 8%, the middle income group from 62 to 42% while the high income group increased from 29 to 50%.
Likewise with wealth (although the numbers are for '83 vs 2016). Lower income went from 7 to 4%, middle income from 32 to 17% while upper income went from 60% to 79%.
That's all just indicators of the increased
polarisation and upwards distribution.
I guess you could consider it a positive that 7% of that 11% drop in the middle income class went to the upper income class vs 4% falling into the lower income class. Keep in mind that this is household income though, and from 1970 to 2023 the percentage of households with both parents working went from 31% to 49.7%.