State is TN
I have a co-worker who used to be my boss that is constantly harassing/bullying me. He was my direct supervisor 2 years ago and came back to the same company in a different department completely. We have the same supervisor and the situation is one of a landlord (me) and tenant (him). He is constantly demanding I do this or do that when it is not my responsibility or not a service we offer. He is constantly complaining to my boss that I am not doing my job, have a bad attitude, and am completely unhelpful. Only the complaints are due to him not getting specialized and entitled treatment that is not offered to any other tenants. He believes he shouldn't follow the same procedures as other tenants when it comes to paying rent, booking meeting rooms, parking regulations, etc. Just plain petty stuff. He's even filed a complaint against me for not helping him set up a wireless router in his office which is 100% against company policy.
It came to a point last week where he called me a despicable human being and a hateful *itch right in front of my supervisor. All because another tenant booked a meeting room before he did. He accused me of lying about the other booking and said I should be fired for insubordination. The room bookings are date and time stamped by a server so his accusations were quickly disproved yet nothing was said to him about accusing me of lying. He'll turn in a complaint that his office is too hot, then turn around 30 minutes later and complain that it's cold, then 30 minutes later complain that it's hot. Then he goes to our supervisor claiming that I'm messing with his office temperature deliberately. Only I have absolutely no controll over it whatsoever. It is all handled/computer controlled by maintenance staff off-location. All I do is turn in a web-based work order that lists the room # and complaint. He knows this is how the system works, our supervisor knows it, yet he is allowed to keep making false accusations about my actions and job performance. He parked on the grass one day when there is a sign posted that says no parking. The landscaping crew asked me to have the car moved so they could mow. When I asked the co-orker to move his vehicle, his response was "make me" then went and complained to our supervisor that I was harassing him.
I really do consider his constant rant and raves harassment and bullying. Is there any recourse for me to take against his behavior? Since we have the same supervisor who just wants everyone to get along, he refuses to handle the situation other than to tell my co-worker "don't do it again". Every time the co-worker complains, our supervisor tells him what he's demanding isn't correct procedure or against our policies or whatever. But the harassment continues. Our supervisor even admits that the co-worker can't accept the fact that I don't work for him and that he crosses the line, only he won't do anything to stop it.
Since it isn't sexual harassment and he hasn't been physically voilent, what recourse do I have? My supervisor told me it isn't against the law to be a jerk. Is there really nothing I can do?Our company has a grievance procedure but my boss has to sign off on it that it requires action from HR. He doesn't want to do this because he said it would reflect badly on him and I have no complaint that would be considered harassment or bullying anyway.

