The worst case is when the company is trying to push a relationship on you that you don't want. There are certain types of stores where the salespeople are commission driven (in the US, at least) and it is IMPOSSIBLE to get the salesperson to go away in many of the places that these things are sold.
My personal least favorite is furniture shopping. Furniture (for me) is a very personal decision on artistic merit that is best done in quiet solitude. I want to touch, smell, examine, and test the furniture and I want to do it at my own pace and without a shadow who won't stop yammering in my ear. Look, I understand that this is a pressure sales job. I understand that you don't want your co-workers to steal your sale. Give me your card, I'll do my shopping, I'll find you if I have questions and when I want to buy something, I'll let you know.
My personal least favorite is furniture shopping. Furniture (for me) is a very personal decision on artistic merit that is best done in quiet solitude. I want to touch, smell, examine, and test the furniture and I want to do it at my own pace and without a shadow who won't stop yammering in my ear. Look, I understand that this is a pressure sales job. I understand that you don't want your co-workers to steal your sale. Give me your card, I'll do my shopping, I'll find you if I have questions and when I want to buy something, I'll let you know.