OP, if you only start caring about men's issues when people you don't like start talking about them, you're no different from the right-wingers who only (claim to) care about LGBT rights when they can use them as reasons/excuses to be racist or islamophobic.
you should really check out my blog as i talk extensively about men's issues and have for years. i made this post on this topic because i have spent years on this site talking about men's & trans issues and the critiquing feminists and feminism's failures historically and in the present day to properly theorize on men's issues & trans issues and how that affects trans men, intersex men, marginalized men, and and people classed as men across the board. a few years ago i made a set of awareness-raising infographics for social media about the stats on forced-to-penetrate rape and how common it was amongst cis men and boys, especially men of color and youth, how it is often excluded from legal definitions of rape and how children who have been forced-to-penetrate have been mandated to pay child support to their rapist, because i am very passionate about that issue.
i have gotten so much shit from so many people over those years for doing this kind of advocacy on here. the original post was directed primarily at my followers, who follow me specifically for my pro-feminist men's liberation & transfeminist posts, in the context of my well-established criticisms of feminism & how it approaches men's issues.
The issue is that feminism, as a theory that tries to explain why women's issues exist, is based on the assumption that "men, knowingly and wilfully, invented gender so they could rape and oppress women".
That is an extremely specific theoretical perspective that far from represents all feminism, even the dominant strain of feminism today (liberal capitalist feminism). That is a radical feminist theoretical approach which I and so many other feminists have critiqued historically and in the present day. Feminism is not one theory, it is a family of theories, which frequently disagree with and critique each other.
Because of that, any attempt by feminists to acknowledge men's issues with all but the most basic handwaves rings hollow. Or, at best, feminists seem to care more about men's issues as ammunition against their political opponents than out of anything resembling principles. This makes feminism incompatible with any other approach to gendered issues, no matter how many offshoots have tried to come up with their own band-aid solutions.
I am guessing "offshoots trying to come up with their own band-aid solutions" is the handwave move you are doing to discredit any and all feminist self-critique and alternative theories as irrelevant, so y'all can continue painting feminism as homogenous and defined entirely by radical feminist perspectives which, while I do genuinely agree they have had a profoundly negative impact on feminism as a whole (again, I have been talking about this exact issue extensively, for years), is far from the kind of feminism that is actually institutionally rewarded in any way. that form of feminism is the kind of feminism which focuses on simply achieving equality for largely white middle-upper class women in the workforce and in politics without radical systemic change.
i don't think its okay for feminism to only focus on women's issues, because women's issues aren't even just women's issues. a lot of them are trans men and nonbinary people's issues, and trans men and nonbinary people's (and trans women's) issues are also men's issues. there's heavy overlap. additionally, activists within feminism have long critiqued the idea that all women share the exact same issues & the general one-issue approach feminism has historically taken, because it ignores race and class amongst other elements. i would also argue its pointless to try to distinguish between women's lib and feminism given the two terms have historically been synonymous or near-synonymous, and what has labeled itself as "feminism" is the strongest and most well-known movement associated with women's liberation and anti-patriarchal resistance.
the failure to properly theorize men's issues is so far from the only issue with feminism as a whole. the problems are real but men are also not special here. just thinking about gender, i'm a trans nonbinary person, who is both a man and a woman and neither. do all y'all understand how fucked over by feminism we have been since forever? the scourge of trans people trying to adopt radical feminist lenses in order to try to appeal to cis feminists, fucking over other trans people in the process? and trans people at large understand that transness and feminism need each other. that feminism that fails to properly understand trans people's experiences under patriarchy and the role of transphobia is flawed and ineffectual but feminism that doesn't fail at that is far stronger and better equipped to fight for liberation for even more people.
its not that i think the things you have described here are wrong per se. i would agree that a lot of feminists only give lip service to men's issues when briefly relevant, and then fail to actually engage theoretically or materially with those issues in a productive way. but i would say that's true largely in part because feminist resistance, like racial and working class resistance, has been very fragmented and ineffectual and has been made that way on purpose by neoliberal capitalism. the same force has also colonized the concept of intersectionality and turned it into something far, far less threatening to systems of power than actual intersectional feminism should.
and overall, though i'm sure this will annoy you, it is impossible for me not to feel y'all have a very one dimensional view of feminism and any attempts to point out feminist self-critique which makes exactly the kind of nuanced analysis of men's position you want is disregarded. which. okay! but can y'all leave me the fuck alone about it. i promise you i am the last goddamn person on this site who needs a lecture about how much feminism neglects men's issues. i have people on this site who want me dead for talking about this exact topic. i have spent so much time and energy putting this exact topic into feminist terms and talking about feminist theorists who point out these issues and critiquing radical feminist frameworks that contribute to this issue. i have had to confront so much radical feminism within trans and feminist spaces that have been weaponized against trans men, trans women, and nonbinary people.
if we fundamentally disagree on how to approach this, fine, but just because this ONE post on my blog made all these MRAs flock to this post like flies to shit does not mean i need seventy goddamn lectures on how radical feminism is the only relevant kind of feminism and any and all attempts to critique and move beyond that kind of feminism are irrelevant and feminism is just sexism and all feminists hate men and all the other patriarchal anti-feminist talking points you and the other person on this reblog chain are trying to make. i know these issues very goddamn well and i care about them deeply and i put so much effort into talking about them in good faith to push the needle towards actually meaningfully integrating them into popular feminism. you are not helping ANYONE with this rhetoric.