What is wrong with your country? Seriously, is there some sort of antisocial additive in the water?
A troubling question, for certain... {borrowing the cranky old man voice..."
Back in my day, sonny..." Wait - I'm barely 50!}
It feels to me that American society (hopefully too broad a bucket!) is increasingly abandoning behaviors of civility and courteousness in public, as once default and admirable traits one should possess... (A fleeting glance at our political situation would suggest there is no more "abandoning" happening there... it is probably all gone.)
But those are behaviors that would seem to be critical to keeping a vast, complex, shared society running smoothly down at the daily human-interactions level. They are behaviors that require an active and ongoing awareness of those around you as well as taking personal responsibility for your behavior and actions towards them, ideally aiming for "the generous interpretation" all the time. (Yes, quite lofty goals, presented that way, but -- better to aim high and fall short, than to aim too low and hit the mark.)
As the individual is continuously encouraged in so many ways to pull themselves into their own self-reinforcing world, it seems that process can only twist the basic guiding philosophy of "do unto others as you would see done unto you" -- from which, really, "public civility" and "public courteousness" naturally arise -- into more of a "do as you wish; others matter less."
The failing to recognize, as you step out your door, that you're entering a shared environment, where all parties are charged with shared obligations towards each other, forms a kind of everyday-disdain for others.
Then, simply cue all the negative behaviors from that individual, which adversely affect others, while the individual no longer notices and increasingly, wouldn't care anyway.
Heavy sigh -- thanks for letting me vent