For those uninformed on what happened, here's the readers digest version:
Me, Cortana (Grace), and Taylor one of our con friends, entered the costume contest at Gen Con this past year. We were in the same category as Kegan (RVB) as some metroid marine or soemthing, I didn't quite know what armor it was. Anyway, we did our thing, he did his, we walked away with 2nd in category, he walked away with nothing. Now at first there was nothing, and we hit the hotel. That night on Facebook, we were musing with some other of our friends on what we could do as a group next year for the contest. Kegan comes into the thread (never being asked, talked about, or involved in any way) and "calls" halo. Now of course we weren't even discussing Halo so it went over as basically just a stupid dick thing to say. We got into it, him insulting our costumes, me returning on that line (with about 5 other people telling him to eff off at this point) and finally, he stomped out, we unfriended and blocked him. In the coming days, he kept spouting off at random, threatening Grace and her and our costumes, saying he was going to find us in the convention and destroy our stuff (which by the way was screen capped and will be sent to the Gen Con staff during badge registration next year). After that things seemed to calm down up until this, and since none of us has said two words to him, I can only assume he's going to cling to this grudge for a good long while.