I'm sorry you had that happen.
I haven't done that shop so I'm only guessing by
some guidelines that I have read.
It's important to say the product is just for you so they believe they can make the sale during that transaction. Saying it's for someone else leaves the possibility that you will consult with them.
I have seen this sort of guideline on other shops for example, mattress.
Again, I don't know how your guidelines were presented.