The simple reality of modern capitalist customer-supplier relations or at least when it comes to grocery industry. All modern companies flood the client with an absolute obedience and respect beyond deserving at the cost of its workers simply cause the client is spoiled for choice when it comes to competition. Industries that have little field for innovation can't out-compete their opponents with new ideas so they stay competitive by increasing the customer relations and service quality. When my country was in the communist era this kind of client behaviour was unacceptable cause almost all industries were nationalized and competition was non-existent, you bought was you were supplied and if you complained you can take a half-mile long walk to another shop.