Why do women get mad when you make the oservation (not in a derogatory way obviously) that a woman's hair color is not her real hair color?

Most women change thier hair color. Even if it's just highlights. For example if she's got dark eyebrows, she's probably not really a blonde. I mean it's so obvious. Nobody is saying it looks bad. So why do women get mad at people noticing the painfully obvious?

Why do women get mad when you make the oservation (not in a derogatory way obviously) that a woman's hair color is not her real hair color?
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