Are texting and emailing making us incapable of normal human interaction?

In his New Yorker blog, George Packer relays a thought-provoking conversation with his roofer:

“It turned out that cell phones had become a major headache in his work. Customers called him all the time, expecting him to hear every little complaint even while he was wrestling with a roof hatch. Meanwhile, they were more and more unreliable, not answering their phones, missing scheduled appointments. Even worse: they had no common sense any more. They called him about a leak in the first-floor ceiling—two stories below the roof—without bothering to check the second-floor radiator, which he discovered to be standing in a pool of water. It had all begun in the last couple of years, and it was driving him and every other contractor he knew crazy. They were all noticing the same thing. “It’s the technology,” the roofer said. “They don’t know how to deal with a human being. They stand there with that text shrug”—he hunched his shoulders, bent his head down, moved from side to side, looking anywhere but at me—“and they go, ‘Ah, ah, um, um,’ and they just mumble.