Woman and martial arts?

A lady at my office who does kickboxing got hurt a couple of weeks ago. This morning another lady at the office started talking to me about the kickboxing girl and, to my surprise, I had to hear that some people, including men at the office, think that it is "common" for a woman to do martial arts and that it is not something that a woman should be doing. Very few people at my office is aware of the fact that that I also do martial arts and not to embar the gossip girl, I just kept quiet. This statement really shocked me as I consider myself to be very femine and definitely not common. I have also noticed that my sister always change the subject when I want to share something about my training with her. I don't care what people think or say, but I am a bit upset about the perception out there. What do you think?