Why is this girl always nitpicking at me?

There is this girl in my friendship group who is nitpicking at me unnecessarily and endlessly teases me. I don’t mind it but sometimes it can get annoying especially when I am in a bad mood, I never give her the reaction she wants but I just want to know why do some girls just endlessly nitpick at a guy? Also have any of guys experienced this with a girl before?
Why is this girl always nitpicking at me?
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