Basic banter. How stupid am I?

There was a flat party yesterday. When I went in I saw a guy friend with 3 of his friends who I recognise but don't really know. So my friend called me over and I went he offered me his hand then said, my friend Jack here thinks you're very attractive. I just froze in my place for 2 seconds then did a little bow and said thank you.. I BOWED!!! -.- then he twirled me around and I left. I was really embarrassed!!! How should a girl react in a situation like this? What could she say? Also, do u think that's just banter or it might be genuine?
Basic banter. How stupid am I?
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