Newbie isn't an insult. N00b is derogatory, not newbie. Also if you read the post;
[quote]4)STOP CALLING EVERY CHARACTER MATHIUS OR EARL GREY!!! xD[/quote]
This suggests the player it was aimed at and the GM were already acquainted. So it's probably an in-joke.

Not that it matters since all this shit is super-old. Necro-support to the rescue!