What's a sharp-reply to someone who annoys you because you don't care about brands?

[M'aimes-tu tu?]

I am not fluent with expensive brand names (nor do I ever want to be), and because of this, I do become an object of scrutiny among my peers. What's the best thing I can say in reply when someone asks me why I don't give a flying monkey about what's the tag inside my jeans or boxers?
Nah, that worked when I was 12.