I can understand where you are coming from. When I started my new job we had to do a 3 day clinical before we could start on the floor. The clinical instructor assumed I didn't know what I was doing just because of my gender.

Eventually I was asked how long I had been in the field and it turned out longer than any of the other people in the class. I also happened to be the only one to score a 100% on the clinical exams. People need to stop judging by anatomical features and by skill level instead.