I am the jerk here?

My mom and her side is all native American. She has this feather fan on display in the living room. A bunch of us were over for dinner yesterday and I made a comment about how it looked kinky with these leather tassle things hanging from the handle. I picked it up and pretended to smack my one sister's butt with it while laughing. My mom got offended as did my oldest sister. I have 2 older sisters. I got lectured essentially. I still don't think making a joke is wrong.