Kroger v. Harris-Teeter on senior discounts

What does it say about Kroger v. Harris-Teeter that while both have loyalty cards, only Kroger automatically recognizes that a card holder is a "senior" and entiteld to a 5% discount that day; at Harris-Teeter, for the same discount on Thursdays, the customer has to be ask or be asked before it is applied ot the bill?