Entitlement isn't always money. Sometimes they feel entitled to invade your home any time they please without contributing to the household, and even creating chaos and tension while they are there. Sometimes they feel entitled to disrespecting their parents, blaming them for their own failures, and placing the responsibility of all they don't have on their parents. Sometimes they feel entitled to their parents "handling" their affairs - finding resources for them, filling out paperwork, smoothing over problems. Sometimes they feel entitled to leaving their children with their parents and expecting them to care for them.
Entitlement comes in many forms, A Dad, not just money. And it comes in any classes, not just upper or middle class. Just because kids didn't grow up with a new car, the latest phone, etc. doesn't mean they don't feel a sense of entitlement.