i honestly don't get the point of mens right activism or whatever one would like to call it. no one is really going to care about any of our problems anyway.
I think you might get a lot out of reading about historical and modern activist movements and what they did.
“Convincing people who are not members of our group to care about our problems” is a thing that activists sometimes try to do, but it’s actually a fairly small part of what I see most activists groups doing day-to-day. Here are a lot of other things they do:
Making people who are members of the group (low-wage workers, say) aware that the group exists and can do things for them - “hey, our union organizes shops like yours”, “if your boss is breaking the law we have lawyers who can take them to court for it”, “pay into the monthly insurance collective and we’ll look out for your family if you get hurt on the job”, “the way you’re being treated isn’t right and we can hook you up with a better job”.
Creating a space for members of the group to share their experiences so people can notice patterns, ask each other for advice, and be validated in their experiences - “Sometimes I make reckless financial decisions because I just feel like saving is hopeless, it’ll all get taken anyway” “I went to Bob for a payday loan and he lied to me about the interest and fees” “the beat cops on 3rd street are assholes about ticketing delivery vehicles and my boss makes me pay that out of pocket” “hey, did you know your boss is not allowed to make you pay tickets out of pocket if that drops your income for the pay period below minimum wage?”
Organizing to create services and support that doesn’t exist yet - “Let’s form a union!” “I’m a lawyer, I want to start a law organization that sues over labor and safety violations!” “What if we had a collective insurance group?” “What if we went in together on getting a daycare permit so we could save money on childcare?”
So there are a lot of ways in which men’s rights activism could be valuable even if you were right that ‘no one (who isn’t affected) is going to care’. Men’s rights activists could form groups to talk about their experiences, notice patterns, develop vocabulary to describe their experiences, and better understand what the lives of other men are like. Men’s rights activists could fundraise to help one another, make one another aware of resources that exist, and figure out how to bring new resources into existence. This is honestly the majority of what many activist groups do - they directly provide a service, or they’re a resource for their members and a source of affirmation, solidarity, and concrete material resources, and they’re informed about the legal rights of their members and pick targeted battles to protect and expand their legal protections.
I’m not saying that trying to make more people aware of a group’s problems, demands and needs is a bad idea - often it’s a great idea. But, for obvious reasons, it’s the most visible kind of activism, and that means that if you’re not involved with any activist groups you might think it’s the only kind of activism, and so if you decide it’s a bad idea you might decide that doing any activism is pointless. And that’s just not true. If you believe that trying to convince women to care about men’s rights concerns isn’t going to work, there’s still a lot that a men’s activist movement can do.
Even better, doing this might make convincing people to agree with you easier. If you say “my group runs a homeless shelter for men who are fleeing domestic violence”, then I bet lots of people who don’t currently believe “men fleeing domestic violence is a common problem” will be confronted with the fact that it is, and maybe that will change how they think about male victims of violence. And hey, if they don’t? There’s still a homeless shelter for male domestic abuse victims! It’s often easier to spread the word about your cause once there’s something concrete you are doing and can invite other people to participate in.
So I think you should expand your conception of activism, and you might find some kinds of activism that seem worthwhile to you.