Yep, it's really rare. I've only experienced it a few times, but it's a beautiful thing when it does happen.
Research from Cambridge confirms, people are more likely to listen to white men about marginalization or discrimination against other demographics.
I also love what you said about "getting it" not being a destination, but a perpetual state of seeking to understand. Guys who are telling women how to make feminism work better, or who are pontificating about aspects of female experience they don't actually know much about are wolves in sheep's clothing and they make things harder/worse with that sort of "help."
Really good piece!