WASHINGTON -- Americans' fast-paced, high-tech existence has taken a toll on the civil in society. From road rage in the morning commute to high decibel cell-phone conversations that ruin dinner out, men and women behaving badly has become the hallmark of a hurry-up world. An increasing informality -- flip-flops at the White House, even -- combined with self-absorbed communication gadgets and a demand for instant gratification have strained common courtesies to the breaking point. "All of these things lead to a world with more stress, more chances for people to be rude to each other," said Peter Post, a descendent...