What's preposterous about it? Minimum wage is less now than its been in 50 years. Do you really think that your average person has it better now? It's hard to get into a trade and your only other route is college which will put you in debt. Then once you have a degree you have to actually get a good job.
This doesn't even get into the fact that normal people are competing against people with wealth for the same coveted spots in colleges. That typically means better high schools, more opportunities, less debt (parents can cover). It's not surprising to see why younger people are upset. They economically don't have it as good as their parents!
It's easy for most of us to simply write off these people as lazy, stupid, whatever. But, we often forget how much easier we had it and just how much luck plays into things. Shouldn't we be trying to find a solution where people don't need luck to make it?