Youth and even young adults seem caught up with instant communication at the expense of people around them. Recently, one guy at our church had a cell phone go off. OK, a natural "slip", you think. But it was at the communion rail. And he opened the cell phone to check it out!
People loudly talk into cell phones or seemingly into the air (headsets are getting more popular ... shades of the Cloud City security guy in Star Wars). They even interrupt talking with the sales person at a cash register to answer a call.
A USA Today article about this abysmal lack of common courtesy suggests that perhaps it's because this generation of parents have not taught their kids that good manners are important. Plus technology makes social multi-tasking easier, though comprehension may suffer.