An approach for people who are marginalized to feel stronger is to reclaim language that was previously used against them, and to repurpose it to mean something positive when applied to themselves.
See: "queer" to the LGBTQ+ community, "bitch" for women, and the "n-word" for the black community. In this specific case, my understanding - I'm not a woman, but am an ally to them - is that "bitch" means a strong woman who does what she wants, regardless of societal expectations.
But there's also a tendency I've noticed of American female writers to pepper their writing with expletives, as if this makes them come across as tough, when for me it achieves the exact opposite.
See: "queer" to the LGBTQ+ community, "bitch" for women, and the "n-word" for the black community. In this specific case, my understanding - I'm not a woman, but am an ally to them - is that "bitch" means a strong woman who does what she wants, regardless of societal expectations.