Being rude is bad for your health. thats whats Oprah is saying... And it makes sense if your always rude and upset imagine, ugh, how gross. But besides that, being on the other side of the counter as I have so many times, working in Pharmacies, I know that people as a majority are just  rude, always over the smallest detail they are not happy with, it can be the color of the bag that the product comes in, yes ridiculous like that. A lot of rude customers and people just figure that they are not going to see you again so it does not matter. What kind of mentality is that? Be nice people, not only is good for you, but think about all the other people in the world who dont have money to fling at a waitress, and here you are disrespecting them for doing their job. tsk tsk.