I can see that.
Dude's may be initially attracted to the shorter one's face, but then they see the other one's boobs. This creates competition, and a slight "hatred" between both. Women hate on their friends more than guys do. That's one of the reasons why they give bad relationship info. If one or two in a group don't have a man, or unhappy, do you think they want the other chick to be happy? NO, HELL NO, they don't.