We tried to go to a KFC in Atlanta many years ago, and they refused to take our order at the drive-through. We could hear them inside, but they absolutely refused to acknowledge us. They gave us the initial greeting, then nothing. Since then, I've never eaten at a KFC. I know, I shouldn't boycott the chain because of one bad restaurant.
Strangely enough, that same night, we were treated exactly the same at a hotel. We could hear the people having a party in the back room, but no one came up to tend to us. We eventually went to a different hotel. Maybe it's just Atlanta?