As I mentioned here, the criterion you use for sanity appears to be way too weighted towards agreeing with you. The example you gave of an MRA being "insane":

the rise of masculinized women will lead to the "Fempocalypse"

is not encouraging here. While this position does sound absurd, that's not the same as insane. The way to test insanity would be to look at their arguments for the above position.

Having said that I don't actually know much about the official men's rights movement except that they have legitimate grievances and that the PUA community says nasty things about them. Nevertheless, you might want to start here.