Not exactly the same thing, but in college I was in one large auditorium class as a sophomore with this light skinned Jamaican cat..being we were the only two Blacks amongst like a couple hundred cacs, I somehow figured we shared some common ground and would be cool or something. Initially, I'd greeted dude and tried to dap him but he just sent a cold draft in my direction..I assumed he was having a bad day so when I passed him again days later in the hall I gave him a slight head nod to let him know I recognized there was another breh in the building..once again, cold draft.
So I let it go, and commenced my quarter (semester) hanging by myself..
Now, Id noticed dude was constantly in the company of cacs and cacs alone grinning and showing his teeth. Now, me having had enough experience with cacs I knew how this would inevitably turn out. See, you cant be friends indefinitely with cacs because sooner than you expect they'll slip up and reveal their Devil nature..
I dont know what happened here, but towards the end of the quarter dude was hanging mostly by himself and trying to 'whats up' me and small talk whenever he'd run into me..But Id already established links with a couple thorough brehs so I wasnt having it.
I dealt with breh by letting him learn on his own..