Wife Needs Bathroom Privacy

I was talking to a friend the other day and she was complaning about not being about to go to the bathroom without her husband coming in and interrupting her. She says that he just walks on in and starting shaving or showering. He says that they have been married for 15 years and this should not be a problem for her. She thinks that the bathroom is suppose to be where you have private time. She asked me what I thought and I said; "Well, I think it is a person's private time, but should you have not locked the door if you did not want anyone in there with you". Of course this upset her because she thought I was not on her side.

Would love to hear your thoughts on bathroom time.