There is a more detailed explanation somewhere down the comments
Yeah I had already seen that, but it was so nonsensical I was hoping for something a bit more solid.
I appreciate you finding the longer source. Not sure why you're getting downvoted for sharing it...talk about shooting the messenger. I'll respond to it here, since I can't reply directly to @atomicpoet@atomicpoet.org's post on Mangane.
No offence to Chris, but their take here is utterly deluded. I'll avoid using "bro" with them (not that it's a particularly common part of my vocabulary, to my knowledge) out of kindness, but the reason they want it avoided is just insane. Suggesting that a friendly "hey bro" has anything to do with the toxic "bro culture" they describe is like suggesting Java has anything to do with JavaScript. Or cars are related to carpets.
Calling someone "bro" is no different to "mate". With the wrong tone or context, it can be passive aggressive, but by default it is jovial and good-natured.
Chris seems to have serious problems understanding context, and seems to be completely ignoring one of the first rules of online social interaction (and, to be honest, all social interaction): assume good intentions. They're looking for something to be angry about. And so they find it.