I was there when the men's rights subreddit was created. It was actually posted about and promoted in the socialism reddit for like a week. That's about as long as it took to become reactionary. The first few days there were a lot of feminists there ready to address men's issues and evaluated it just like this. They were all pushed out quickly. It's almost a case study how that community formed and developed.

Ultimately you are right, though. There is so much about it that is steeped in patriarchy and are issues that women are fed up with, too. I think feminism has a place for men's issues because feminism is a way to tackle human issues and that space could have been a great place to spread that. It seemed it might have been for a day or two even. But the reactionary elements of the MRA movement are either deaf to it or actively undermining it.