Why do some females’ run around and say they hate men and that all men are aholes , but the second she meets a great guy , she falls to her knees?

She basically talks shit to her friends’ that all men are trouble and no good , but the second she sees a guy that she melts for , she is on her knees for him and praising him like he is the best thing that ever happened to her.
Why do some females’ run around and say they hate men and that all men are aholes , but the second she meets a great guy , she falls to her knees?
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