I think millennials and zoomer are just being open and honest about things that always happened.
This is partially true, but things are actually worse than they used to be in some ways and better in others. I think that, more than anything, the conditions have accelerated a bit more.
I was born in 1976. I remember managers being completely toxic assholes–that was just how it was. But, when I was a kid, there were still pensions–you worked 40 years for a company and they took care of you. I think that both of these things are gone–managers can’t really get away with being as cruel as they used to, though I know that’s out there. Also employees don’t expect a graceful exit at the end of their career.