I think you’re conflating two different things. There are a variety of social factors that affect age cohorts differently, and a lot of that comes down to the experience during formative years. We are a product of our environment in many ways, and it’s not nonsense to study and opine on these shared experiences and how they shape us. Class solidarity is an entirely different subject. You likely do have more in common with your social class across generations, but that doesn’t mean you don’t have anything in common with wealthy millennials. I wouldn’t let lazy journalism own the concept of generations itself.