Some may have been planted by management, while others are from disgruntled customers with a bone to pick.
I can't make out why he seems to have a bone to pick with almost everyone.
have a bone to pick with
I have got a bone to pick with you, Mr. Patel! Over your last cottonseed oil shipment to Liverpool.
Honey, I have a bone to pick with you. I don't mind you getting into the bathroom first in the morning, but do you have to be in there so long? You know, I have to get to work on time, too.
I have a bone to pick with you. You still owe me the fifteen dollars you borrowed.
