I've heard it before. I had immediate mixed emotions about it. Lots of frustration, and a little resentment. There's this oppressive thing that I've dealt with for years like a chain around my neck and you think it's cute?? Then I went for the patronized angle, like how dare you. But later on, I just sort of accepted it. Plus, I was trying to get lucky. The thing is, no one else is required to see you as you see you. In fact, they can't. So she may very well be sincere. She doesn't know how it makes you feel, only how it makes her feel. If she feels it's just another thing that attracts her to you, take it as the positive thing she means it as. Maybe later you can have a conversation about how you feel conflicted or unsure about it.