Are they stuck up to you because they think you dont have money? are they rude to you because of the way you dress? Or are they nice to you and willing to help you no matter what?
I notice that if you walk in carrying a Louis Vuitton they give you more attention and respect (I'm sure it would be the same if you had a Chanel, Fendi etc.) When I bought my first one I had a Coach and they sort of brushed me off. Now that I have my limited edition LV bags, they always treat me great! I also think that the small LV boutiques inside Saks or Bloomingdales are a little more friendly than the main store.