Men may use a knowledge of feminist theory in oppressive ways. It's not our place to tell women how to reject femininity - this is another form of patriarchal control. I've done this. Men may divide women into categories of 'real feminists', whose opinions are treated with respect occasionally, and other women, who are ignored and trivialised. Both practices are forms of sexism, ways to maintain patriarchal power.
Men are also good at intellectualising and abstraction.
Sure, it's nice to get brownie-points from feminists, but this shouldn't be the motivation for doing stuff. This is aptly named 'feminist-fucking'. The best use by men of feminist theory is to develop a critique of men's behaviour and thinking and awareness of the possibilities of change, not the development of a critique of feminism. We should explore what implications feminism has for men's position in the world. In academia, we can examine the practice of existing, often patriarchal, academic disciplines.