there is a huge difference between feminist activism benefiting men as well as women, and feminist activist energies being applied to issues that only improve the lot of men
i am hugely supportive of groups who are working on men's problems (provided they aren't blaming feminists for those problems), such as organisations working to reduce the prevalence of male suicide (a friend of a friend has set up one such organisation), or support for men on the receiving end of intimate partner violence
but my activist energies, limited as they are, will go into those initiatives that best serve women, such as combating male violence and challenging gender stereotypes. the fact that challenging those things will also benefit those men that are harmed by the patriarchy (men are at significant risk of male violence too; gender stereotypes are harmful to men too), is a good thing, but it is not my primary focus given that women are so far behind as a group