This, I think, may explain a lot of that mentality too. People tend to hyper-focus on things that stand out, and negative things stand out. Spending enough time steeping in that feeling definitely seems to be connected to rising levels of meaningless cynicism and jackassery.
I do think there’s also something to be said for people who spend their whole lives glued to social media generally having pretty boring experiences when they’re not being spoon-fed dopamine. If you don’t go out and have your own adventures, the adventures you see in fiction are the only ones you’ll be familiar with. It’s hardly surprising that they’re so incredulous of the stories of people who are getting out there and living life.