YOU are at a party and the person in front of you is not really listening to you. Yes, she is murmuring occasional assent to your remarks, or nodding at appropriate junctures, but for the most part she is looking beyond you, scanning in search of something or someone more compelling.

Here’s the funny part: If she is looking over your shoulder at a room full of potentially more interesting people, she is ill-mannered. If, however, she is not looking over your shoulder, but into a smartphone in her hand, she is not only well within modern social norms, but is also a wired, well-put-together person.

Add one more achievement to the digital revolution: It has made it fashionable to be rude.

I thought about that a lot at South by Southwest Interactive, the annual campfire of the digitally interested held in Austin, Tex., the second week of March; inside, conference rooms brimmed with wireless connections, and the people on the dais competed with a screen in almost every seat: laptops, or even more commonly, tablets. In that context, the live presentation that the people in the audience had ostensibly come many miles to see was merely companion media.

But even more remarkably, once the badge-decorated horde spilled into the halls or went to the hundreds of parties that mark the ritual, almost everyone walked or talked with one eye, or both, on a little screen. We were adjacent but essentially alone, texting and talking our way through what should have been a great chance to engage flesh-and-blood human beings. The wait in line for panels, badges or food became one more chance to check in digitally instead of an opportunity to meet someone you didn’t know.