I hate people who get off on doing that. No, it is not okay. It creates a hostile workplace. It is also slander. I would probably contact an attorney for a free consultation if you have done to HR and nothing has been done. This person is out of line and the company could be liable if they do nothing to squash the "rumors"

__________________
Proud to say I haven't shopped at a Wal-Mart since Sept 2003