Girls, would you be offended if your partner asked why you never wear makeup?

I recently asked my girlfriend why she doesn't wear makeup and she took it as an insult. She thinks I think she isn't that attractive which isn't the case at all. I told her I think she's gorgeous and that I was just genuinely curious but I think deep down she thinks I don't mean it. I was really surprised by her reaction because she is a very confident woman. How would you react?
Girls, would you be offended if your partner asked why you never wear makeup?
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