Because I'd rather offend people needlessly than use needless words, and you have to choose one or the other.

Reminds me of a quote from Robert Heinlein

"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 untravelled, 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."