If a girl is mean and a smart ass towards a guy?

Is it because she likes him? (bear in mind she is usually the shy/sweet kind of girl with most people, but turns into a sarcasm machine towards me). She is always telling me that I'm weird, how lame my taste in entertainment is and how hers in better, she makes fun of me in public and tells people she likes doing it because its fun, tells me how unfunny my jokes are and that I'm the only one laughing at them etc (of course, I do the exact same thing back to her and its always fun and we get a lot of laughs out of it). Of course I like her a lot because I've never met a girl like her, she is fun to be with and she is always smiling and making eye contact when we talk, could this be her way of showing affection?
If a girl is mean and a smart ass towards a guy?
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