Why did my guy friend keep calling me silly?

Anonymous
Today it was kinda of weird. My guy friend and I were meeting at the library. We got to the library around the same time and he saw me and said I was silly. I didn't think I was wearing anything silly. Then later we were sitting next to each other and he kept poking my arm and kept your so silly. I was confused because I didn't think I was doing anything silly. Was it his way of saying I looked funny or was I just being really amusing?
Why did my guy friend keep calling me silly?
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