How to blacklist?

[Plotinus]

When you join a game, you PM the mod saying you don't want to play with ____. This prevents them from signing up after you. Some mods don't do that, so if they sign up after you, you /out.

If they're already on the list of players, you don't sign up for that one.

You can put them on your foes list in the User Control Panel, then you won't see their posts in the discussion forums but you'll see them in queues and games still.