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Honesty and Integrity
If your mission statement and personal conviction matters to you at all, in this situation I believe being truthful should be the first choice in any situation. What could occur is that you add a ignorant charge to the bill for the comment or charge a off hour/weekend rate to somewhat compensate for the nasty remark. That remark by the way was nasty and not called for but we have all had it happen, at least I have and I responded the way I just mentioned.