Due to its important role in dialogue, politeness has been widely studied both from a theoretical point of view and at a practical level in virtual agents [1, 4]. However, few attention has been given to impoliteness, even though virtual characters, such as Non Player Characters in video games, should be able to use it to improve their believability. Impoliteness consists in performing verbal attacks towards the interlocutor [3], most of the time deliberately, while politeness consists in minimizing verbal offenses towards the interlocutor [2].