―An anti-caster

"What's going on with this movie is the exact thing that Mako spent his entire career fighting against - Asians being relegated to the background and stunt-double roles because they're seen as having inferior acting abilities. You say this movie is diverse - how is the main cast diverse?"
―An anti-caster being stupid LOL

Anti-casters are one of the factions involved in the Casting War that was started back in December of 2008 by M. Night's casting decisions. They are the group of Avatar fans who oppose the cast of The Last Airbender since it doesn't have enough AZNS in it. They tend to spend their time running around message boards whining about the cast. Anti-casters are most likely a bunch of weeaboos since they want AZNS in the cast because they're weeaboos and yeah.