So, ArenaNet's been handing out 3 day bans for offensive character names or offensive chat. The ArenaNet support team
posted a thread on reddit (warning: NSFW language) to explain the bans and give further explanations to players who thought they were banned unfairly.
Besides the hilarity around redditors getting outed for offensive and childish language, it's worth noting that some of the bans are in response to accounts being hacked.