Reminds me of a study that showed that the most anti-women bias online came from other women.
In fact, wouldn't we expect to see this behaviour more in males because males can have multiple mates to a greater extent than females can.
http://ideas.time.com/2012/10/04/womens-inhumanity-to-women/ http://www.huffingtonpost.com/dr-robert-lusson/womens-bias-a...
Alternatively, maybe it's talked about every day but amongst women.