You argue that choosing any subset is arbitrary but it is clearly not if we choose that subset based on a set of data that shows behavior which society disapproves of (attaching criteria to our subset inherently makes it non-arbitrary).
Now, you could argue that choosing women as a subset is arbitrary because you don't think that the representation of people on money should be correlated to population statistics. However, why are you arguing against correlation for pictures on money but not also arguing that nothing should be correlated to population statistics at all (or perhaps your comment wasn't perfectly written? same as the article?).
In general, it seems that you are also choosing to be arbitrary as well. In addition, you seem to lack compassion for other people who are expressing their concerns about their right to live a happy life, free from harassment. Whether or not you agree with the small details in the article or whether or not they are 100% accurate is not important. If you can't read the article for the overall concept it purveys, and feel some sympathy for the author, I feel sorry for you.
(1) http://www.bbc.co.uk/news/education-21698522 (2) http://www.workharassment.net/index.php/sexual-harassment-in... (3) http://www.livescience.com/2428-men-discrimination-women.htm...