What is your honest opinion...?

Is it "stuck up" if I prefer the girl I'm dating to know the difference between Dolce or Prada (Etc.) and Old Navy? LOL. I don't care where she shops. I just think she should know the difference. I was out with a girl last week who honestly thinks there is no difference. I admit, it bugged me. Maybe I'm just more demanding? (Even the tank top in my avatar is Dolce. Haha.)