I have definitely been greeted with "what's up, brother?" several times. And I took it exactly the same as when other people have greeted me with "what's up, br

I have definitely been greeted with "what's up, brother?" several times. And I took it exactly the same as when other people have greeted me with "what's up, bro?" -- the former came from someone a bit older than me, and the latter came from someone my age. Intent was 100% identical as far as I could tell.