But they are. They are hurting the perception of the fandom and makes us all look like completely dysfunctional individuals who are incapable of effectively interacting with the non-fandom "mundane" world.
Despite the fact that geek culture has become, admittedly, a lot more mainstream in the past couple of decades, there is still a stigma associated with overt expressions of geekdom like what is shown in those movies. Next time you go on a job interview, wear a Trek or Wars costume, and tell me how that works out.