Attributing attitudes with feelings of entitlement, money obsession and persecution complex to millions of people in either group surely demands some evidence.

Attributing attitudes with feelings of entitlement, money obsession and persecution complex to millions of people in either group surely demands some evidence. Does this exist in some reasonably objective survey or is it assumed that if you're a Boomer or Millennial, you inevitably carry such baggage with you? It reads well but is it in fact valid to talk about internal states of mind in this way on the part of so many?