It may not just be you but me as well. I hate to be cynical but a lot of people out there are stupid so if you are trying to have a conversation with them, beyond a few words, they have lost comprehension. I have found myself that even trying to make the most basic of points with people causes them to lose interest in seconds, unable to focus on what I am saying, and showing signs of disinterest. Sometimes someone will ask me a question and the moment I try to answer it they are fiddling with a cell phone, an i-Pod, or something else and I have to literally say, "Are you interested in what I am saying or not?...Then please put the phone away while I am talking."
I think it is part of our culture at least if you are in the U.S. It is rare to find intelligent prolonged conversation with anyone. Beyond the lastest junk on television, people don't have anything to add to a conversation. Good luck.