I still think that people yammering away at their phones or bluetooth earpieces while in line to order a coffee (or, even worse, doing so while talking to the cashier) are rude and obnoxious. And that people sitting across a table from each other staring at their smartphones and texting are antisocial and a bit ridiculous.

Basic human decency and social norms haven't changed as much as you think. Walking around talking to a computer strapped to your face, staring at a little screen in the corner of your eye, is profoundly anti-social.