Things that say "I'm a piece of trash"

[Jay Riall]

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I think people deserve a tip for good service

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I don't think it deserves a tip atall except when I get absolutely exceptional service.

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Bad service is really, really common, and doesn't deserve a tip at all.

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What is the common reaction if you don't tip when someone gives you bad service? I often find myself tipping just to avoid making a scene as the sole reason.