I have a female housemate. She sometimes wears a very short skirt. I…

I have a female housemate. She sometimes wears a very short skirt. I don't have any problem with that. A couple of days ago, she told the group that she was "free-balling" while wearing that very same skirt. Again, I don't have any problem with that. I think it's wonderful! The problem I have is that she denigrates me for free-balling under a kilt that is 2-3 times as long as the skirt she was free-balling under. How is this equality? It is extremely sexist!