It’s easy to be infuiated by stories of cops treating people differently based on their clothes. It smack of class bias. But this is really just one example of a general feature of human decision making: we make decisions based on usually-reliable cues that are open to manipulaton. The classic example is price: we tend to assume that price is an indictor of quality (“you get what you pay for”) but this makes us vulnerable to getting ripped off by businesses whose strategy is to shoot for a ridiculously high profit margin on their products, couting on people to assume that since the product’s price is so high, it must be quality. It’s not clear we can do without such shortcuts, and as long as we use such shortcuts, people will exploit them.