HIE,
People come early to davening and use their time to check their emails which they just checking 3 minutes ago anyway.
One of the first times I saw someone perusing a smartphone during davening, I felt shocked and appalled, until it hit me that the fellow was using his smartphone as a siddur. I personally think it’s much better to use a siddur than a phone to daven, but it was a good lesson for me in dan l’kaf zechus.
Some people that you talk to can’t hold them self back from looking at their phone while their talking to you. HULLO? I’m talking to you! Whats wrong with you?!
I agree that this behavior is intensely rude. Smartphones have been an extremely disruptive technology to society so far, causing rapid changes to culture, language, and behavior. Some of those changes have been positive, but there are also some serious negative impacts, many of which you enumerated in your OP.
That said, your blanket condemnation of your fellow Jews and this generation makes me uncomfortable.