This meme has reached the level of conventional wisdom, so any response feels a bit like trying to empty the Atlantic Ocean with a thimble, but the evidence that Gen Z and Millennials are in any way materially worse off than their parents is very weak.
They are, in fact, doing quite well:
https://twitter.com/johanknorberg/status/1780638119156408480
https://www.economist.com/finance-and-economics/2024/04/16/g...
And that's before we account for the truly massive and unprecedented wealth transfer that's about to happen when the Boomers really start dying in big numbers.
When it's all said and done Millennials are going to be the richest generation of all time and still talking about how uniquely bad they have it, which I guess is the most Millennial thing imaginable.