Is sisterhood just a myth women romanticize to promote women's empowerment?

I've seen countlese women i. e mistresses show little remorse and empathy when it comes the feeling's of the woman caught in the middle of steamy love affairs or the damage caused to the children, but women make it seem like men are always the bad guys, is sisterhood just a myth used to promote unity and empowerment amongst a demographic with selfish self serving needs just as brotherhood can be a myth?

Is sisterhood just a myth women romanticize to promote women's empowerment?
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