People spoofing other usernames

Recently there's been a case of a user on ITH spoofing another username, by simply adding an _ to the end of their username.

Please don't do this. I don't know what else to say except that its pretty pathetic, and actions like that aren't welcome or tolerated on this site. For everyone else, please ignore posts by that user. In this case, their username is DBZ_

Thanks,

Mike