As the lovely users have mentioned above, this is a glitch that some users use, in most cases, because they think that it's entertaining. With this said, we don't have an issue with the glitch itself being used, but it becomes a problem when it is abused and a different person tries to make someone else say inappropriate things and break game rules. If you see this glitch being used harmfully against you, I would encourage you to take a screenshot and send it in to a staff member. These kind of reports can be tricky to show that the person saying nasty things isn't you, however, but here's the best way you can show this (and also be able to know when someone is using the glitch):
In your in-game settings, there is an option that allows you to show both the username and the character name in the chat, rather than just showing the character name. When someone uses the glitch, their character name may appear as yours, but their username will not change. All staff members that I know of use this chat setting when in the game, so you don't have to worry about users being accidentally banned for things they didn't say. Be sure that you get your character's name and username in the screenshot, as well, if you wish to send in a report.
Hopefully this cleared everything up. Feel free to message me or another staff member if you have any questions. I will go ahead and lock this up since your question has been answered. c: