"When people cease to use manners in everyday social interactions, they are essentially throwing sand into the workings of a machine that has low tolerances for friction in the first place." - Paraphrased, can not recall who said/wrote it.
Alternately, when people overuse words like please they lose all meaning.
See a recent episode of The Allusionist ( http://www.theallusionist.org/allusionist/please ) discussing the difference between American and British English, when it comes to the word "please". Brits use it way more than we do. We both think the other is weird (rude, condescending, hoity-toity, etc.) as a result of the difference.