My guess is cause they don’t have real world experience. Their entire life is surrounded by machines and tech. Millennials can cross reference bot DM’s with real life propositions and adjust. But most these new kids need a handbook on how to talk to people. The concept of randomly striking up a convo with someone you don’t know from nowhere and chopping it up is anxiety inducing. The comfort of being behind a screen is removed and it scares them shitless.
My $0.02