When “but” is tagged on to an apology, it undoes the sincerity. Watch out for this sneaky little add-on. It almost always signals an excuse or cancels out the original message. It doesn’t matter if the statement you make after the “but” is true—it makes the apology false. It says, in effect, “Given the whole situation, my rudeness (or lateness, or sarcastic tone, or what-have-you) is pretty understandable.”
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