A good test of whether or not this kind of initiative makes sense is to kind of reverse engineer it. So let's set up  work place spaces that are just for men, spaces the exclude women. As dumb as that sounds, the fact is that there are spaces, in the work place that, because of chauvinism or down right misogyny, do exclude women. However since the problem of the absence of women is a problem with men and not with women; it is unlikely that the necessary changes in men's behavior towards women will occur if men are isolated from women or visa versa. Exclusion isn't the solution, inclusion is.