manager encouraging bad service to staff

I got very dissapointed to see how the store that i spend every month my hard earned salary in, treated me like i erupted from some human zoo if there is one. But it didn't surprise me that how can a cashier know the meaning of good customer service when management themselves doesn't know the meaning of that? it was on the 1st of December when i accompanied my friend to the store to buy some liquor items when he got given bad attitude by the cashier ldy at the liquor dept. he then expressed his discomfort to the lady, when all of a sudden the lady verbally attacked on me. To cut the story short the matter was escalated to the manager who then said will deal with the situation. the next day when i went to the store to buy some few items thought to ask if he did smthn as promised, and my surprise came when i was the one now accused of being on the wrong, and told the way the cashier was crying, i mean how can a manager take emotions when dealing with such a sensitive issue? it was not even the first time that the same cashier did such and the manager brushes it like its nothing. i have been very loyal to that store but believe me when i say will never set my foot in that store again