I would counter that you often think you know it when you see it, but may be incorrect. Knowing more about the circumstances and why something is done often reduces or eliminated the creepiness, in that what you assumed was the reason behind the behavior wasn't correct.
Creepy is a subjective descriptor. One person's creepy is another person's not-creepy. Things may be both creep and not-creepy at the same time, depending on who is observing it. I don't know that you can say someone's perception of creepiness is incorrect as that implies that there is an objectively correct label for creepiness.
