Boutique Mon Ami

My sister in law & I were in this shop just recently looking for an outfit for my daughter's wedding. I am a plus size lady & found the staff to be a little pushy & opinionated. I did find something that looked very flattering despite my size. We decided to go for a coffee & think about the outfit. I went back to let them know out of courtesy that I was going to think about the dress overnight & come back the next day, as they have a no exchange or refund policy. The woman said to me "Oh we thought you'd given up & gone to Kmart to buy a dress." A little rude & uncalled for we thought, seeing that I was going to be spending $100's of dollars in her shop. Was that comment because I was a plus size lady, or because I mentioned I was from the Northern Suburbs?