But, in case you don't know what being a jerk is...here is a list:
No flaming. We're all nerds here, let's play nicely together.
No personal attacks. If you're in the role playing boards and you want to call each other's character out, go nuts. But if a mod thinks it's personal, the thread will be locked until a staff member can look at it.
No trolling. What do I mean by trolling? This hobby involves heavy costuming. Not all of us are awesome sewers or crafters. This doesn't mean anyone has the right to talk smack on someone else's work. Constructive criticism is one thing, if it is asked for. Please refer to the golden rule. Also, if you don't have anything nice to say...maybe it's better to not say anything at all. We all have to start somewhere.
Most importantly, don't be a jerk.It really is that simple.