Was my mom right for doing this?

So my moms friends that are girls came over and they rang the doorbell and my mom was in the shower and my sister is too lazy to wake up to get the door. So i was awakened by the doorbell. I just got up and answered the door in my boxers then i just left to my room. My mom came in my room and said why did you answer the door in your boxers? I said whats the problem? Its my house i can wear or not wear whatever i want. She said no you cant. I took off my boxers in front of her and said yes i can. So now she's not letting me go to the movies tomorrow with my friends. Its my house right? I can wear what i want. I feel like just walking around the house naked in front of her and her friends just to give her something to actually get mad about. Who was right me or her and why?