Judging people based upon viewing choices

It might not be nice, but I often judge people by the television shows that they watch while exercising at the gym. Each machine is equipped with its own TV, and I find the programming choices that people make to be utterly fascinating. Not only are these people watching these programs, but they are also willing to let everyone in the gym know what they are watching. Under these circumstances, I would expect people to be more discerning about their choices, but from what I have seen, they...