A small note on suicide, OP: Many more women attempt suicide than men do - I think it's around three times more attempts by women. Men are, sadly, more often successful, due largely to the methods used - although I think also partly because men are less likely to seek help. So I don't think it's as straightforward as men suffering more from mental health issues. Complex (and difficult) issue.
I don't deny that there are some serious issues facing men.
Yes, being human is hard. This doesn't negate the need for feminism, sadly.
There is nothing to stop you working to help out with any of those very real issues to help men or the men in your life, OP. They all sound like great causes. But please don't dismiss the work being done, constantly, and often unseen, by many women who are just trying to do their best to protect women and girls.
Also, re 'strident' - it might be worth looking at the suffragettes, and how some of them were portrayed. Vilified, mocked, derided, insulted, abused, beaten, etc. It's very hard to go against the tide, and it's often seen as unbecoming in a woman. That's a very deep seated tendency - we don't like women who speak up or complain (see: 'Karen'). I don't knw your relative, she may be awful, but also I would bear in mind that women have had to fight tooth and nail for all the freedoms we enjoy (the vote, toilets, healthcare, access to abortion, divorce rights, etc - none have been generously handed to us, all of these things involved and involve a struggle) and sometimes that involves losing friends and pissing people off, I'm afraid.