I'm white, and I shop at the Gap for jeans. Their original boot cut jeans (women's) fit great, and are always on sale for like $30, sometimes less. Everything in the men's section is made extremely big/really shapeless, I think. For about the same prices with better fitting and better looking clothes, I prefer Benetton.
Along with Banana Republic (and maybe Old Navy?), they have great deals in the sale section.
I've also never noticed the thing with white people and the Gap before, but now that I think about it, I think of white dads wearing USA themed Gap shirts and hoodies.