These are the rules of Pharyngula. Abide by them when you comment here.
The first law: This is PZ Myers’ blog, I am the ultimate overlord, and I can be a poopyhead if I want to. Posting here is a privilege granted by me, not a right, and posting privileges can be rescinded at my whim. Do not annoy me, and worst of all, don’t bore me, and we’ll get along fine.
The second law: There is no second law.
What we do have is mores. We have mores out the wazoo! This blog has been around for about 8 years and has a horde of active commenters, and the whole bloody mob has shaped expectations for what is in-group behavior and what is out-group behavior. Pay attention to the culture here.