Where is the line between behavior subject to ethics and behavior subject to

Where is the line between behavior subject to ethics and behavior subject to

Where is the line between behavior subject to ethics and behavior subject to "common sense"? For example, the question of whether to hold the door open for people behind you hardly seems an ethical one, and while we might call a person who doesn't hold the door open names, we won't call them unethical. Yet there are other cases which clearly are ethical. So how can we distinguish between being a nice person, and acting ethically?

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