Why hate men just because?

I recently had a friend post an image of a T-shirt that says mute the men. She also commonly posts things that fit the man hater category. In the event this comes up as a topic of discussion when we are in public how do I respond to this? She is an extremely promiscuous person and yet anything a guy does is always wrong. I don't understand this way of thinking. Thanks!
Why hate men just because?
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