Might help also to describe what you think feminism is, since it’s one of those terms that is overloaded.
I once had a physical therapist tell me she wasn’t a feminist because she thought women couldn’t be as physically capable as men when serving as soldiers, and seemed to believe feminism requires treating women exactly like men.
I told her I was a feminist because I believe in equal rights for men and women, an idea she did not seem so opposed to.
Not really.
Black Lives Matter is a movement specifically to shed light on how cops abuse their power towards people of color and frequently go unpunished for it. Black Lives Matter is not about addressing how white people may suffer at the hands of police brutality and if you’re trying to argue that it is, then you’re either disingenuous or ignorant.
You do have a point though, where both feminism and Black Lives Matter focus on one group over people over others.
Feminism as a movement specifically sheds light on the systemic violence against women and gender-diverse individuals under patriarchy. That doesn’t mean men don’t also benefit, but it does shed light on the primary issue.