I want to run two scenarios by you - bear with me
Scenario One
Feminist-enthused Male Person: I love the idea of equality! I'm a feminist! What can I do to promote feminism?
Feminist: Actually, because of the history of men's subjugation of women, we're asking men like you to call themselves pro-feminist, or feminist-allied. This makes sure that the ownership of the women's movement remains with women. And we don't end up with a mother's Union situation. See what I mean?
Feminist-enthused Male Person: Sure, I get you - that makes sense, given how male privilege works. Hard not to get what I want - but hey, it's not about me, it's about the struggle, right?
Feminist: Right!
[they high five enthusiastically and begin overturning the patriarchy]
Scenario Two:
Feminist-enthused Male Person: I love the idea of equality! I'm a feminist! What can I do to promote feminism?
Feminist: Actually, because of the history of men's subjugation of women, we're asking men like you to call themselves pro-feminist, or feminist-allied. This makes sure that the ownership of the women's movement remains with women. And we don't end up with a mother's Union situation. See what I mean?
Feminist-enthused Male Person: That's so oppresive of you! And mean! And Shrill! How can you expect men to care about women's issues if you don't let them dictate everything about how women's issues should be handled? Screw this 'equality for all' nonsense, I'm going to sulk and pout and fling my toys around, probably in a long-lasting and draining and derailing manner! It's about ME, damnit!
Feminist: siiigh.
see where I'm going with this?
None of the really feminist-enthused men that I know give a stuff about whether they'd rather call themselves feminist or pro-feminist. Because they get that feminism has to be female-led, and that whatever the noun is, the men who want to promote feminism have good and important work to do. In short, the truly feminist men I know (and I know precious few, so I'm jealous of all these feminist men everyone knows so well!) know that it's not about them.