The older generation always says the the younger generation is ungrateful. When they become the older generation they will say the exact same thing, and so it will carry on.

That's exactly what Socrates was talking about approximately 2400 years ago.

Quote: “Our youth now love luxury. They have bad manners, contempt for authority; they show disrespect for their elders and love chatter in place of exercise; they no longer rise when elders enter the room; they contradict their parents, chatter before company; gobble up their food and tyrannize their teachers.”