With friends like that who needs enemies? Your friend should not be insulting you nor should you be insulting your friend. Dr. Phil would call this leveling which means you are trying to knock someone else down to bring them to your own level so that you can feel better about yourself. Why can't we all just get along? Sounds to me that you are two birds of a feather flocking together.
I only want to dress up at conventions and places of the likes. She dresses up for her pageants and her theater. I do not have a problem with any of these but she constantly nags me about how weird it is to dress up as characters from TV shows I like.