Why do girls pick fights on purpose?

Im not saying all girl do it but what is so wrong about having a nice, pleasant day without getting into an argument? Maybe I have been spending too much time with this girl but we usually have a good time but then, after a few days, it starts. She picks fights over a word I said, or about how I'm being quiet and having and attitude or about how I'm being friendly and too comfortable, or a face I made or how I'm walking around without saying a word, or how I made a comment with a smug attitude, I mean, really? I understand if it was a big deal or something important but this? Then I try to explain to her that it wasn't my intention to come off that way and she just gets mad and "talk to me when you get your act together". Am I being insensitive or is she just looking for attention?
Why do girls pick fights on purpose?
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