Why do my sister women have an intense hatred for women but have a love for men?

Okay, so my sister (older than me) and I were having a conversation the other day, and she mentioned that all females hate her for some reason. Now I listened to see what was her defenses and she said that she didn't have any, that she knew. It seems cocky, right? She has a boyfriend. So it looks like she always throws herself at him and goes out of her way to do things for him when he isn't doing that in return for her. Then later today, I asked her about a guy she was talking to. And she admitted that she knew he had a girlfriend but still talked to him!! Around men, she acts differently. And I don't like that, especially homewreckers! She praises men but bashes women. Every chance she gets! I don't understand this behavior, and I don't like it! I constantly have to bite my tongue whenever she speaks like this. What is wrong with her?

Why do my sister women have an intense hatred for women but have a love for men?
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