I say bro, and lol a lot to show non confrontation....Tone is not possible on the net, so that is my thing to show my friendlyness....I do NOT say bro in public, and very rarely am I actually laughing out loud, when I type lol.....lol
i must say i noticed that to, it does seem it only happens on forums that have to do wth flowerhorns though LOL, and not only have i noticed they have converted me to!
the best thing to do is just join in brah. i try to be more creative with it though. like, "whats up broseph?" or "yo braheem." or "hey brohan sebastian bach."