"White Maggot" is undoubtedly meant as an insult but it is not racial. It is used by whites to whites. It is the term traditionally used in Australian football to insult the referee if you disagree with him. It is part of our marvellously vivid Australian slanguage.
But as the world gets more and more neurotic about all negative speech, our betters have decided that the term must be banned and that spectators using it will be evicted from the match. Even the Salvation Army disagrees with the ban, however. Details here
