I do not see any issues with anyone trying to keep an offensive username, there is nothing wrong with it. It is their choice moreover I have never seen any policy on keeping weird usernames. I have read a few topics on this board which were asked what is the meaning of using a username or what thought process was used to keep such a username. This is the first time that I have encountered a topic where you seem to think that some username is offensive. This is an anonymous forum and everyone here does not care about the username. If you are finding it offensive then report that user to the mods and let them decide. I do not think they will look into such report as they are busy with other important works.