> Generally, it's because MRAs tend to find gains for women zero-sum.
The stereotypical MRA does.
> There are issues with regards to divorce, child support, and custody that can be discussed, but all these can be addressed as a feminist and do not require "masculinism" as some sort of a counter.
Your experience might be different than mine. In my experience, any mention of the idea that men can be raped by women, for example, gets shouted down by 'feminists' (you can take that label as you will) as 'hijacking' the 'real' discussion, which is solely about men raping women. Men being raped by men is, at best, a side-show to that discussion. Women being raped by women is similarly absent as a topic.
The stereotypical MRA does.
> There are issues with regards to divorce, child support, and custody that can be discussed, but all these can be addressed as a feminist and do not require "masculinism" as some sort of a counter.
Your experience might be different than mine. In my experience, any mention of the idea that men can be raped by women, for example, gets shouted down by 'feminists' (you can take that label as you will) as 'hijacking' the 'real' discussion, which is solely about men raping women. Men being raped by men is, at best, a side-show to that discussion. Women being raped by women is similarly absent as a topic.