4.) Gamers are anti-social
I think that we've all heard of the pimply, fat, and anti-social gamer living in their parent's basement. However, I think that gaming has changed because of the Internet. Forums, social media, and sharing features in consoles have influenced us to be more social nowadays.
In addition, gamers aren't only interested in video games. I've met a lot of people who are into a variety of sports related hobbies on top of video games so don't judge a person just because of one activity they enjoy.