From Be Nice:
I don’t care how good you are at programming, finding bugs, whatever. If you’re rude, or if you speak poorly to people who don’t understand your… quirks…. you will wind up being shunted to the side. No one wants to work with someone who makes them feel beat down all the time, or someone who they simply can’t understand, or someone whose reaction to every issue is to start wailing about the end of the world.
Being very good at what you do makes you just that: very good. Being very good and being nice: that makes you great.
Read full blog post here.