R-R-Rolling! discussion

My novel LARP: The Battle for Verona (available on amazon and bn.com) is a YA fantasy novel that deals with the topic of social acceptance and bullying. As I am sure you know, people with interests or hobbies that are different than the norm are often treated badly in society. Labels like "geek" "nerd" and "dork" are often applied, in a negative way, to people with unique interests.

So, my question to everyone is...why does society as a whole judge and mistreat people with unique interests?