On a corporate level or any level a man is not going to acknowledge a man he doesn't know. When you start at a job one of the cool dudes will give you the lay of the land and from there y'all find out that y'all have similar interest(video games, food, women, etc) and y'all become cool and might hangout a bit.
I'm from Baltimore and grew up in the city but now I'm 38 and I've been out in the county(not that the county is any better) since I was 18 and I just assume that most of y'all are from inner cities as well and probably live in a suburb because none of us want to stay in those areas if we don't have too. I drive thru to to see my city but then go home to my family and chill. But anyways, we are from cities and we've seen how some niggas get fucked on some "hey shorty you know what time it is" or just unassuming shit like that. So we aren't just going to be on the street trying to speak to every brother or strike up a convo with every brother on the street. And men(Hetero men) are about the opposite sex, so what the fuck do I care about what another man does. "WHAT YOU EAT DONT MAKE ME SHIT".
Now I don't think that just because you look or dress a certain way that you are a "nigga" because that's racial profiling from a black man and that's not cool.
But you have to be smart when you're not in the house and your job everyday is to get home so that those that love you can still love you...and not mourn you.
When I'm out "there" I mind my business and take care of what I have to take care of. I go to the hood because the hood got that good Chinese food lmao, everybody knows that lol. But if you mind your business, those that are out there doing them will mind there's. And if they're hustling and they ask you do you want whatever, unless you do say no and go on about your business.