Girls, do you ever flirt by being a "smartass"?

Its just odd. This girl is so nice to everybody but she is just so sarcastic and a smartass towards me. We have a lot of fun doing it but she never lets up, she is always on smartass mode when she talks to me. I noticed she can't stop smiling or she turns away when I make her laugh, but she keeps telling me I'm not funny at all. Is flirting by sarcasm possible?
Girls, do you ever flirt by being a "smartass"?
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