For the Robert Heinlein fans, there is the quote from the notebooks of Lazarus Long:

Moving parts in rubbing contact require lubrication to avoid excessive wear. Honorifics and formal politeness provide lubrication where people rub together. Often the very young, the untraveled, the naive, the unsophisticated deplore these formalities as “empty,” “meaningless,” or “dishonest,” and scorn to use them. No matter how “pure” their motives, they thereby throw sand into machinery that does not work too well at best."

My father always taught me that courtesy, politeness and respect in society is always something to be embraced -- and it is goes both ways. If you want to be treated with respect, you need to give respect.