Workers are supposed to serve customers (or "guests" I suppose) when they see them but for some reason, when my coworker sees a customer, she walks all the way over to me to tell me the customer needs help instead of doing it herself despite her being completely able to do so. This isn't a "I don't know how to do it" or "I don't know where ___ is".
In my opinion, there isn't a single acceptible reason to do this. "I'm busy with something." I'M busy with something. "Customer is more important." Right, so why is your first instinct to push them on me instead of helping them when you saw them? "Just drop what you're doing. It'll only take a second." Right, so why is your first instinct to push them on me instead of helping them when you saw them? "You know how to do it." You also know how to do it. Am I insane? Just say you don't want to do it and stop getting mad at me when a customer gets mad at YOU.