Well, I have seen the shirt on a couple of my black friends but never on one of my Hispanic or white ones, so I'll just leave it at that.  

It's sort of like years ago, one of the black Platoon Sergeant's I knew was aghast to discover that one of our officers had wound up in Oakland at about 11:30 pm in a soft-top civilian Jeep and survived the visit.   

His response"  "Man! Black people don't be on the street at that time of night in Oakland!"  He wasn't reluctant to use the "N-word" regarding some of his ethnic persuasion when he thought they deserved it.  

That was a constant in the military.  The lazy, the intentionally incompetent, the slackers on sick call; the 'real' black soldiers threw the "N-word" on them regularly.  We honkies couldn't use it, but they certainly did.  

 Different cultures are just different cultures.