Specifically, the sisterhood thing that says that you should never be disparaging about a fellow woman.
However, my friend just made a slightly catty Facebook status about a female celeb's fashions. A few of her friends had a little chuckle, including me, then one of her other friend steamed in berating us all for being unsisterly and asking us why we needed men to put us down when we do a perfectly good job ourselves. 
I must admit, I am a bit
about this sisterhood thing i.e you must never be negative about another woman, because YOU are a woman too. The example I just posted about is a bad one because it's shallow/superficial, but I've seen women chided for, say, moaning about a colleague's conduct at work. Surely, we aren't expected to stick together because we are "all women together"? I find it a bit weird and patronising, like we can't judge women on their individual merits but rather blindy applaud them merely because they own a vagina.
I am willing to concede that I might be wrong, though. I am just wondering where the rule ceases to rule, IYSWIM? Are we allowed to be rude about the cat-in-bin lady because, like, she is a lady?