Summarize:

Say "please," "thank you," and "excuse me." Don't hesitate to apologize if you've hurt someone's feelings or done something wrong. Treat everyone with courtesy, whether they are a fellow nerd, a valley girl, or a person with an intellectual disability. Sometimes, correcting others hurts more than it helps. If a person is sensitive or in a bad mood, or if the situation isn't good, let it slide. (With the exception of health and safety issues, of course.) If you know that a person prefers to be corrected, discreetly correct them and don't make it a big deal. Support fellow nerds. Be there for nerds who get bullied, and build up budding nerds instead of tearing them down for not knowing as much as you do. Nerds are usually pretty good with words because they care about getting things right. It doesn't hurt that they may read more in a month than the average American reads in a year. Regardless, the misconception out there is that nerds use big words. Wrong. Nerds use the right word given the context. Sometimes, the right word happens to be a big one. Extremely smart nerds have the ability to use incredibly basic words to explain incredibly complex subject matter. Make the dictionary and thesaurus your friend. Whenever you come across a word you don't know, consult the dictionary. Whenever you believe you could be using a better word given the circumstances, consult a thesaurus. Skip the overly complex or obscure words if you're talking to a child or someone with a limited vocabulary. The point of communication is to share ideas, not make the other person feel inferior. Nerds are cool. That doesn't mean other types of people aren't cool too. As someone who has likely been bullied and looked down on, the last thing you want to do is do that to someone else. Recognize that prioritizing other things doesn't mean someone is unintelligent or boring. Some people who love fashion also love designing complex websites. Some football players love literature. Don't judge people for not being "smart." Maybe they didn't have the same educational opportunities as you have had. Maybe they have a disability. They still could be interesting in other ways, and you never know what you could learn from them. Nerds don't need to rely upon excitement and danger in order to have fun. They enjoy more wholesome fun, such as LAN parties, watching Star Wars, or building and launching a rocket. These activities can be enjoyed alone (independence is a fine thing) or with friends (the more the merrier!). Be cautious about alcohol, especially if you are underage. This can impair your judgment and could harm your ability to recognize harmful or dangerous activities. Say "no, thanks" if anyone offers you drugs. They could be other nerds, but they don't have to be. While geeks often navigate between social groups, nerds are more likely to associate with other nerds, because of common interests. Maybe if you're an abstract thinker, try to find a nerd who's more practical or technical, and vice versa. Having a friend, or a set of friends, who complement you is as much as anyone could ask for. If you don't know any nerds who are interested in what you do, find a community online or try to get your own friends interested in aspects of nerdiness. The web is increasingly becoming an important social community for nerds, mainly because of its focus on free expression and its utility as platform for technology. Don't be afraid to branch out to non-nerdy friends too. They have their own value and may have interesting perspectives.
Be polite. Use the right words. Ditch the idea of superiority. Seek good, wholesome fun. Find friends with similar interests.