When it comes to food, I have to read labels and buy what won't make me sick. The brand name doesn't matter - the ingredient label does. A lot.
Shoes, I just keep trying on pairs until I find ones that not only fit my orthotics, but fit my feet and don't hurt. Looks, frankly, come further down the list, and brand name doesn't enter into it.
There is, however, one way that I acknowledge that I am a real snob. I dislike singing in unison - if there's more than one person, there can be more than one part, right?