I haven't rtft but my two penny's worth is
From day one I've been helping my son be a good man.
No lectures. Just age appropriate guidance (evolving all the time), idea seed planting and consistent role modelling from me and his dad on all the principles that underpin being a good human.
There is nothing in being a good person that a man and boy can't understand or get behind, it's just, sadly, so often the expectations aren't applied to boys (I.e boys can act out anger with more lenience given, boys aren't expected to share nicely at all times). Especially lacking is the expectation that they should deeply understand the full range of nuanced emotions, have self awareness of all those emotions and... Crucially... Manage all those emotions well.
So...
He's been taught body autonomy and how it's important we all respect each other's and no relationship can be a happy one if that isn't happening. Basic consent concept from toddler age (ok if we take your jacket off now?) all the way through to the biggy - sexual consent - same principle!
That his needs and wishes are no more, but also no less, important than anyone elses and that what happens in any situation should always be a considered balance of everyone's needs and wishes. So when he was 2 that looked like teaching him to share toys well, now he's 14 it's adapted to issues like whether he can play loud music when his sister's doing homework etc (or vice versa)... but the principle is the same.
He has been taught, from the beginning, all the vocabulary he needs to describe all the emotions, not just happy or sad. Everything from envy to elation to regret to nostalgia to frustration to ambivalence... Etc etc
Not just recognise and be able to name it but also consider the best response and ways to handle it, not feel ashamed of a strong emotion but understand it, and it's power or joy.
He sees me and his dad share whatever needs doing. No blue jobs or pink jobs (! 🥴🤯 !)
We (his parents) don't hide discontent or conflict, we take them to each other calmly and resolve it constructively, he sees those conversations (no adult topics of course) and sees both parties being heard and listening.
Always the expectations placed on him are equally placed on all of us in the house. No extra respect because we're grown ups (though we do expect respect - we just give it too), no patience expected from one but not the other... Nothing that implies he must do something, or, is off the hook due to his being male.
We've taught him to take criticism well. By making sure criticism is constructive and given for the purpose of making things better not embarrassing him or shaming him. I.e if he's washing up and I'm drying we have a common goal - clean dishes - so if I spot a bit missed he will redo and not take it personally. He's been taught the value of (for want of a better word) quality control, so 'criticism' is about improving what we're all doing. He gives me criticism if relevant and I appreciate him doing it, I'm not above reproach, same for his dad. His ego is now not so fragile it can't take feedback basically... Which is one of the massive issues you see come up on the relationship boards time and again when a man can't take it and doesn't want to hear it if their partner has something they want to raise and discuss with them. Being able to hear a complaint is so important... As if complaining well... Both are skills.
I have always used things that come up on TV or whatever to drop in concepts without needing to lecture or make him pay attention, just a 'hm interesting, that's a bit of a xyz situation isn't it...' type remark.
I draw his attention from time to time to the fact that when things are going wrong in the adult world it is often because at least one of the adults involved is not handling their emotions very well.
Basically he's empowered to understand and navigate with skill all the complexities of human relationships as deeply as a human can.
I do all this with his sister too.
He often knows I'm upset and need a hug before I do, his family and teachers all love him cos he's a genuinely decent person, and he's just smashed his yr 9 English exam cos the assignment that came up was to write a piece on the ups and downs of relationships.
I think this is an area of parenting I'm most confident on and so far so good, (my oldest is only 14 though, but I'm hoping the groundwork laid will help us through the next few years).