It's exactly the same thing! More white people are killed each year by police than Blacks, but it's important to note the societal dynamics that go beyond just the mere numbers in order to accurately reflect the larger picture. It's important to note the specific ways that Black lives are not being valued in the same way. I'm all for that, by the way.
Until the patriarchal narrative about men having the right to control women changes, it is entirely appropriate to talk about how much of a factor that is in violence against women. Both the World Health Organization and the CDC have taken the position that violence against women is at epidemic levels. The UN has a specific commission dedicated to ending violence against women. That doesn't mean that they don't care about violence against men. It just means that they recognize that there are different components to that problem.
Men are victims of homicide 3 times as often as women but as I've already pointed out to you, a full half of homicides against women are perpetrated by intimate partners (vs. 4% of men). That's a specific societal dynamic in play - one that needs to be talked about. Yes, all lives matter, but women have every right to talk about the very real and very specific ways that their lives are devalued by this culture. And if you don't think so, that's just as bad as any other All Lives Matter rhetoric. If you want to focus on the way that we as a society could be doing a better job of reducing violence against men, then by all means go write about that and I'll be happy to read and support that - but don't hijack a woman's story and say, "What about me?" That's really poor, entitled, and patriarchal behavior.