He's eating the breast how else do you eat it? I'm a proud southerner and I eat everything that's not a wing or a drum with a fork and knife?
I don't know about how they serve KFC chicken in The South, but here on the west coast, the breast piece of chicken has the bone surrounding the meat with it.
So its very difficult, to impossible, to keep trying to cut the meat away from the bone structure.
The more I think about it, I think all pieces of KFC chicken have the/some bone : breast, thigh, drumstick and wing.
So it would be "normal" or "acceptable" to eat all pieces of KFC chicken with your hands.
(If the breast piece was boneless, OK. I understand the knife and fork, but I don't think that's the case here.)