From road rage in the morning commute to high-decibel mobile 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 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 of etiquette expert Emily Post and an instructor on business manners through the Emily Post Institute in Burlington, Vermont, USA.
In some cases, the harried single parent has replaced the traditional nuclear family and there is little time to teach the basics of polite living, let alone how to hold a knife and fork, according to Post.
A slippage in manners is obvious to many Americans. Nearly 70% questioned in an Associated Press-Ipsos poll said people are ruder than they were 20 or 30 years ago.
The trend is noticed in large and small places alike, although more urban people report bad manners, 74%, than do people in rural areas, 67%.
Peggy Newfield, founder and president of Personal Best, said the generation that came of age in the times-a-changin' 1960s and 1970s are now parents who do not stress the importance of manners, such as opening a door for a female.
So it was no surprise to Newfield that those children would not understand how impolite it was to wear flip-flops to a White House meeting with the president - as some members of the Northwestern women's lacrosse team did in the summer.
Impoliteness now means wearing
flip-flops to a White House event
A whopping 93% in the AP-Ipsos poll faulted parents for failing to teach their children well.
"Parents are very much to blame," said Newfield, whose Atlanta-based company started teaching etiquette to young people and now focuses on corporate employees. "Another, media."
Sulking athletes and boorish celebrities grab the headlines while television and Hollywood often glorify crude behaviour.
"It's not like the old shows Father Knows Best," said Norm Demers, 47, of Sutton, Massachusetts. "People just copy it. How do you change it?" Demers would like to see more family-friendly television but is not holding his breath.
Nearly everyone has a story of the rude or the crude, but fewer are willing to admit to boorish behaviour themselves.
Only 13% in the poll would admit to making an obscene gesture while driving; only 8% said they had used their mobile phones in a loud or annoying manner around others.
But 37% in the survey of 1001 adults questioned between 22 and 23 August said they had used a swear word in public.
Yvette Sienkiewicz, 41, a claims adjustor from Wilmington, Delaware, recalled in frustration how a bigger boy cut in front of her eight-year-old son as he waited in line to play a game at the local Chuck E Cheese pizza restaurant.
The most common complaint
was aggressive or reckless driving
"It wasn't my thing to say something to the little boy," said Sienkiewicz, who remembered that the adult accompanying the child never acknowledged what he had done.
In the AP-Ipsos poll, 38% said they have asked someone to stop behaving rudely.
More and more, manners are taught less and less.
Carole Krohn, 71, a retired school bus driver in Deer Park, Washington, said she has seen children's behaviour deteriorate over the years, including one time when a boy tossed a snowball at the back of another driver's head.
In this litigious society, she argued, a grown-up risks trouble correcting someone else's child.
One solution for bad behaviour "is to put a kid off in the middle of the road. Nowadays all people want to do is sue, to say you're to blame, get you fired," Krohn said.
Krohn, who often greeted students by name and with a hearty "good morning", once was asked by a child if she got tired of offering pleasantries.
Sienkiewicz, whose job requires hours in a car, said she tries to avoid rush-hour traffic because of drivers with a me-first attitude.
"They got a lot of things and feel entitled to get a lot of things"
Oradell, New Jersey
The most common complaint about rudeness in the poll was aggressive or reckless driving, with 91% citing it as the most frequent discourtesy.
Margaret Hahn-Dupont, a 39-year-old law professor from Oradell, New Jersey, noticed that some of her students showed little respect for authority and felt free to express their discontent and demand better grades.
Close on the heels of the baby boomers are the affluent teens and young adults who have known nothing but the conveniences of computers and mobile phones, devices that take them away from face-to-face encounters and can be downright annoying in a crowd.
"They got a lot of things and feel entitled to get a lot of things," said Hahn-Dupont.
Speaking on phones loudly is
an all-too-common bad manner
Bernard Scanlon, 79, of Sayville, New York, would like to see one railway carriage set aside for mobile phone users to ensure peace and quiet for the rest.
Amtrak has taken a stab at that by banning phones and other loud devices in one car of some trains, especially on chatty Northeast and West Coast routes.
But if those trains are sold out, the Quiet Car service is suspended and anything goes.