Interesting situation

Why is it women continue to be so- well 'bitchy' to one another?
It seems like the ugliness of 8th grade will never go away for some women- they seem so upset with women that are better looking- more talented, stay home, work- are richer - or poorer then they are-!
Why and what is the competition about- we understand it is for men when women are young- they want to pro-create with the best mate and want no competition-- but why is it that after the time of pro-creating women are still so god damn nasty?
any ideas?