If a girl engages is constant "bickering" with a guy?

I'm not complaining. I think this girl is cute and very smart. She is very intelligent but we always seem to have opposite views on many things and we argue a lot, its nothing serious, its very playful and we always smile and laugh when we do it. Its just very constant, like 90 percent of the time, people who know us laugh and tells us we fight like little kids. Its not really fighting over a stupid thing, we actually have these well thought out arguments and neither of us want to give up and we keep going and going.

I do it because it makes me feel good. I like her and the fact that she can keep up with me makes her more attractive. She doesn't really argue or even tease/taunt other people the way she does me, I know that's how our dynamic is but the question is, why is it so different than the way we act with everybody else?
If a girl engages is constant "bickering" with a guy?
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