Sorry for the delay, I've only just got the chance to sit down and reply. To your point about incels, how would you feel if someone making a meme saying "all women are gold-diggers". How do you react to incels saying things like women are trashy and only want trashy men and not good guys, or women are weak porcelain dolls and wouldn't survive without men. Would your reaction not be that not all women are like that? That most women aren't like that? This is the same shit, the genders are just reversed. Is it any less true if the rebuttal comes from a woman arguing in good faith vs an extremist TERF? I'm not defending incels, but if they sound the same as someone making a good faith rebuttal, maybe it makes young impressionable men and boys think they might have a point. And if they're right about that, what else might they be right about? This is exactly how people get sucked into cults and far right groups.
I feel your example with guns (while still a generalisation) is different from this kind of meme because it's about appealing to empathy. This meme is not doing that, it's using shame to supposedly get men to reflect and change. I argue it's not very effective, and there are way better ways to do this. You share one example - appeal to empathy. I've seen memes praising men for positive actions they take (e.g. green flag memes).
This kind of discourse is also harmful to transmac individuals. I've unfortunately seen trans men being ostracized from the very communities they relied on for support as soon as they 'pass'. Once they look just like other men, they are seen as a threat and are unwelcome. If this kind of divisive language and approach only impact those doing harm to women, then fine. But it's not and it's doing a bunch of collateral damage in the process.
It's shouldn't be hard to point out positive role models without resorting to belittling people. Most men have strengths (literally) most women don't - let's talk about how they can use those strengths to be a positive force in society. I see way more jokes and memes saying men are trash rather than talk about how they are can be important and positive part of the movement towards equality. Just like the LGBTQIA+ movement would never have made it as far as it did without the help of our allies (and trust me I'm not giving them most of the credit), we're never going to get equality and freedom across genders if we don't work on bringing men as our allies too.
Thank you, you were able to put the point I was trying to make much more succinctly and elegantly.