I was told that it wasn't always this bad in the US either. A few decades ago, people were warmer and they socialized more. It looks like in the past few decades, social alienation and fear have set into the American society and started making people ever more distant from each other. Likely because of the stress and angst caused by economic insecurity, consumerism, the ensuing social and political conflicts etc etc.
I agree on all points. I think tech/phones have this effect as well. People become more like the machines they interact with. Seattle is probably the most tech-dominated city by ratio of residents in the industry in the US…