This is an effect of human tribalism and occurs in just about every aspect of human life. People need to be part of a group, and part of being part of a group i

This is an effect of human tribalism and occurs in just about every aspect of human life. People need to be part of a group, and part of being part of a group is castigating outsiders. Businesses that recognize this and play to it will always have more loyal and ardent customers, but you have to be willing to black-ball some potential customers in the process.