Never heard of them, they seem equaly bonkers as the feminist groups.
And by feminist groups I don't mean groups that actually care about equality, but the social justice warriors that are offended if you look at them the wrong way.
It makes sense though, that there is an polar opposite of the Feminist SJW groups.
I feel like most of the western world is equal enough and I don't see any need to be nitpicky, there are pros and cons with every gender, and some of those pros and cons can't be fixed.
I also don't care for people who throw words like misogyny or misandry around making it meaningless, there are places in the world where being a woman is more or less living hell (I can't think of any where being a man is, there might be some though idk), once you throw words around they lose their meaning, and that svcks.
I'm gonna stop now before I turn too political.