Tractor Supply review: Dog ear drops

I was advised by my veterinarian on which ear drops to purchase for my dog. I was told to get them at tractor supply. I went there and found what I was looking for. When I brought them to the counter to pay for them the sales girl whose name was Nikki asked me what I was buying this item for. I told her and she grabbed them and put it behind the counter after telling me that these are not good to use so I am refusing to sell you this item.
It made me very angry and I refuse to shop at this location again. The location by the way is in Wetmore Michigan.