John Scalzi at his Whatever Blog has a great flowchart explaining who gets to be a dick on his website:

I would create something similar, but that isn’t the way it works around here. In general, anyone can be as big a dick as they want. I just don’t have enough people commenting to complain. In fact, I love it when someone yells at me.
As I was preparing to post this, Rafael yelled at me about being mean to Moe Tucker and more generally The Velvet Underground. This is strange, because I love the band. Some people are such big fans that they can brook not even the smallest insults. Thus, I believe it is with Rafael. Here’s a taste, but check out the whole thing along with my response:
Who gets to be a hypocrite on this website? I do! I alone! Ha ha ha ha!
Update
John Scalzi’s comment policy is very funny. Check it out.