This is directly from the terms of service that we all agreed to in order to play the game. These can all result in bans.
Harass, threaten, embarrass, or do anything to another player that is unwanted. This includes posting insulting, offensive, or abusive comments about players, repeatedly sending unwanted messages, attacking a player based on race, sexual orientation, religion, heritage, etc. Hate speech is not tolerated. (See also “Harassment Policy” below.)
Create character names or otherwise transmit or facilitate distribution of Content that is harmful, abusive, racially or ethnically offensive, vulgar, sexually explicit, defamatory, infringing, invasive of personal privacy or publicity rights, or objectionable in a reasonable person's view. (Also see “Naming Policy” below.)
“Trolling,” which we define as posts or threads that knowingly lead to overly strong, negative, and emotional responses for mere shock value, is not allowed on the Service. Accounts created with the sole intent to “troll” will be immediately and permanently suspended. Constant personal attacks are also considered trolling. (See also “Forum Guidelines” below.)