Unless things have changed majorly, the way I remember it from some time ago is that you don't really have to be much of a super ass to be banned from the Codex at all. I mean let's be realistic here: Being an insensitive, racist asshole of epic proportions is more likely going to make you a community leader than get you banned over there. You can go all out ad hominem and call someone a "ghey jewish faggot niggah ass clown" without anyone even taking notice (business as usual).
But God forbid if you post some man b00bs or goatse (or other stuff that non-Codexian co-workers might not find overly tasteful) without a "NSFW" disclaimer. You forget that disclaimer, you're toast. Insta-ban. Hasta la vista, baby.