It seems like a lot of people at my office have MP3 players with their ear buds in all the time. It burns me up to go talk to someone, and they don't take those da mn things out to give you their full attention. If someone was texting, I would stop talking and let them finish and maybe say "Oh, am I bothering you"? Since I am a high level manager, I would ask them to come see me when they were through with their personal business.
I was brought up in a different time and had parents (at least my mom) that insisted on courtesy and respect. When I got a job at the local grocery store stocking shelves and bagging / carrying out groceries, my mom basically grabbed me and set me down and gave me the lecture that you will be respectful and treat the customers like they are the only thing that matters. When I started running the register, she made a big point that I greet each customer personally and count their change back to them. I also was on the hook for saying thank you and please come again. I can't tell you how angry it makes me when the kids today that are at store registers just throw your change at you, and look at you with their mouths hanging open catching flies. Courtesy and respect have gone out the window, along with personal responsibilty as far as I'm concerned.