The jury's still out for me on this one. On the one hand, since feminism is about liberating women as a class from male oppression, I'm not sure too many of the oppressor class can actually be feminists. I don't know many men who can truly appreciate what it is to be a woman, they are socialised differently and have a huge amount of privilege that they very rarely recognise, let alone acknowledge. Then there's things like the studies done on men speaking over women in all kinds of contexts - that can't be a good thing in feminism.
On the other hand, I'm not sure feminism can achieve its aims without collaboration and cooperation with all kinds of people. It seems to me counter-productive to exclude men from a movement, when they're the ones (generally) with the power to change things.
I asked my DH whether he calls himself a feminist. He said no, he has feminist tendencies. He says he can't call himself a feminist because he can never experience what it's like to be a woman, just as, being white, he can never experience what it is to be a POC. So he feels it's appropriating something he cannot claim.
It's a toughie! But I can only endorse those men approaching the issue in a respectful way, who actually listen to women and accept their views, rather than riding roughshod over everything and pointing the finger at feminists they think are doing it wrong.
I once saw a Twitter exchange where some dude was debating a feminist. He reckoned he had done 20 hours of women's studies at college and therefore knew what he was on about. He was put straight very quickly! 