> Many MRAs are feminists shamed and kicked out for not being radical enough.
Is feminism an institution? I was not aware anyone could be "kicked out" of feminism for not being sufficiently radical. I would know, being a not-particularly-radical feminist myself.
At any rate, this is quite dubious. The only MRAs I know of are not even close to being merely "insufficiently radical feminists," except perhaps in the same sense in which Catholics are insufficiently radical atheists.
Note that by "MRAs" I mean people who self-identify as part of the MRA movement. There are, I'm sure, many people out there who are aware of and interested in men's issues who could also qualify as feminists. Such people, such as myself, choose not to be identified with the MRA movement because of all the misogyny that travels with it.
I suppose you might make the argument: "why not refuse to be identified with the feminist movement for the same reason"? There are (at least) two reasons. First, feminism is less associated with a small particular people and institutions than MRA. This may just be because feminism is bigger. But, whatever the cause, I don't feel that identifying myself as a feminists as closely associates me with objectionable activities at the fringes. More to the point, I simply don't think most feminists generally are as virulently anti-man as MRAs are anti-woman. Again, maybe this is attributable to the size of the movement. I know that there are feminists who are virulently anti-man, but I think they make up a small fringe of the overall feminist movement. Ultimately, though, this is just a question of what labels one is or is not comfortable taking on.