White trash radar

Someone should investigate the phenomenon known as "white trash radar". You probably haven't heard of it but will know exactly what I'm talking about when you hear it. Here's the setup:

You have a trashy neighbor to the north, a whole apartment complex full of them to your east, and then some more a block or two south who insist on spinning the tires on their redneck Dodge every time it rains. Remember, this is purely hypothetical and not from any personal experience. You think they're just living their trashy lives, shopping/sleeping at Walmart, hollering in the middle of the night, and yelling at their poorly trained pit bulls, but then you see them walking between each other's houses, going to Walmart together, and sharing food stamps. Could there be a white-trash version of gaydar? Would it be called dumbdar? Retardar? Cheapbeerdar?