It's sad that situations like this happens, but it does...
A few years ago, I had finally been able to talk a relative into joining SL. Her first day, I took her around the grid to shop so she wouldn't look like a "newb". Shopping for all the essentials: shape, hair, skin, shoes, etc.
As we made our way through, I had her stop into a Skin store. Not even a "popular" brand, but they had good looking skins, so we went there. Within two minutes of us landing in, the customer service girl didn't say a word. Yet, she simply walked up and banned her. I sent the CSR a message and asked what happened. She got snarky and said that "you can never be too careful". Appalled, I explained that she had money... money she'd bought and money I sent to cover anything extra (due to purchasing limits as a beginner).
Needless to say, we'll never go there again. The owner did not respond to my message and that's fine. However as for my relative, that rubbed her the wrong way. After I explained why people react like that, she understood the paranoia, but it has made her leery to say the least. Episodes like that can ruin a new user's experience. Let that be a lesson for us all.