Narcissism of small differences

Narcissism of small differences is when two people or groups that are very similar tend to act really different from each other and even fight with one another. It's like if you and a friend have the same car, but you both do things to make you cars look or act different from the other person's car. Even though the cars are basically the same, you both make changes to make sure you're not seen as someone with the same car. So even though you both have the same car, you act like you're very different from each other.