What does it mean when someone says 'youre not bad looking?'?

Anonymous
A lady in the grocery store stopped my sister and told her she was pretty. She told her we both look alike and that "he's not a bad looking dude so that's a good thing"... I'm confused as to what she exactly meant by that. I thought when someone says that it basically means you're okay.. not ugly but not super good looking either. Maybe I misunderstood her?
What does it mean when someone says 'youre not bad looking?'?
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