Seriously, the situation isn't that serious. Awkward, yes? A little excessive? Definitely. But one that requires legal intervention? Not really in the same league as far as I can tell.
I think the thing that might be throwing us off is that it bothered you enough to write.
As for the courts, if you're honestly being harassed then that's what they're for. If the situation is just awkward then you find other remedies.
I must admit, the information about dragging your boss into the fray did concern me. If that's not outright harassment than it's the most bizarre behavior I've heard of. Trying to coerce an answer by causing you problems on the job is no laughing matter.
The final word is that if you think courts/lawsuits/mediation are all overkill, then you have to reassess just how serious or trivial the matter truly is. If the guys just a mouthy jerk you've already answered addressed his request.
If you're fearful of your fate, safety or job, then it's time to ask for help from outside sources. After reading the remarks, I'm not sure anymore that this is a serious matter. Bizarre, perhaps troubling, but to you it's minor. Maybe talking it out was the answer.
Edit: One thing I must add is how my problem solving antenna go up on issues like this. I've learned that when my wife says she has a problem it means just to shut up and listen, not to try and find solutions, which is very frustrating. She dumps her problem on me, kisses my forehead now cleansed, but gives me the ulcer!
Second, I hate bullies. I've had a few incidents in dealing the stalkers of several girls my wife and I know. These guys really, really rile me up.
Last, I don't like lingering problems. If something is an issue I like to deal with it and move on. The wool gathering and ruminating drive me nuts. So I hope you find a solution you can live with and return to a happier existence. BTW, I now ask my wife to preface her speech with defining her needs as looking for a sounding board or a solution on the front end.