"Anonymous does not forgive" repulses newcomers? Hardly. That was one of the in-jokes that I found hysterical immediately upon reading for the first time.
I'm a newcomer to these boards. I don't get some of the jokes, but I have figured out a lot of them. Even some of the AA doesn't require that you have years of background, as there can be a self-contained punchline that requires no knowledge of 4-ch history.