That clip shows that the young black lady did give a brief hug to Ole Joe, so she wasn’t completely snubbed.
[We have to be careful watching ‘selective’ clips regarding political candidates. They don’t always tell the whole truth.]
I saw it too, so if that’s the case, explain her facial expression. And the hag standing next to her grabbed her sign and scolded her. Mean old fart!
Strictly based on the young lady's expressions and body language my bet is she felt totally humiliated and snubbed by him acting as if she didn't exist.