People literally just switched to another brand, discovered it tastes the same or better, and won't be back.
It's a decision they may have made in haste, but considering grabbing a case of beer only takes about 5 seconds a week, now that the new habit is automatic they won't be back unless there is a compelling reason to do so.
The customers are gone. Deal with it BUD!
They never believed that you would respond with your wallet to one of their lectures.