Ok, since Holly (
) is around, I can explain our theory.
As all of you know, Mr. Captain Obvious aka Brad (ew.) is just disgusting. Andy has listened to his voice for quite a long time, and that's the reason why Andy can barely listen to other people now. Okay, he can still listen to the little kids screaming and begging for him not to eat them, but that's not the point here.
We are going to suggest Jimmy to get a portable blackboard where he can draw instructions to Andy instead of talking to him (sadly, Jimmy hasn't noticed Andy's not able to listen to him.