Why is it that women are always singled out whenever it comes to women's issues but men are never singled out whenever it comes to men's issues?

For example since women get sexually assaulted way more than men do people always title it to stop violence against "women and girls". If black women were getting killed as often as black men then it would be "black women's lives matter" but since the majority of black people getting killed are men it is only "black lives matter" not "black men's lives matter".
Why is it that women are always singled out whenever it comes to women's issues but men are never singled out whenever it comes to men's issues?
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