1.) After I wrote the post, I called the host of the game and told him to apologize to the other guy for my behavior and wish him good luck in the tournament. The host, Alex, was a little confused by my request but he said he would do so. I hopped into the shower to get ready for going out later in the evening with my wife and when I got out of the shower I had a voicemail from Alex that pretty much said, and I paraphrase,
"That guy was already gone when you called earlier and I didn't realize that you two were arguing. The rest of the guys told me about the whole thing and I want to apologize to you. I don't know that guy that well and let me tell you, if I had known he was being such a d*ck I would have said something sooner. He is actually a friend of a friend but if things went down the way they were explained to me, he is certainly not going to be welcome to come back to my house to play cards again. This was my tournament and I don't want that kind of sh*t going on here. I'm sorry that it happened and I hope it doesn't keep you from playing with us again in the future."
Now, this was greatly comforting - because it showed that the other players at the table apparently agreed that the kid was being a dick and the host was gracious enough to apologize to me - but it was also slightly frustrating because I only held back at the time out of respect for Alex. After all, it wasn't my house and if the situation were turned, say, Alex had come to our tournament back in November (which he did, actually) and then had insulted one of my friends - Fro, Canonico, Junell - I would have never invited him back to my house, regardless of who was actually in the wrong. When I kept my mouth shut and walked out, I was mad as hell, but I was trying to be gracious and respectful to their relationship and not ruin my chances of being invited back. Had I known he was "just a guy" I probably would have invited him to step outside, although even then it was probably better that I didn't, for the obvious reasons that fistfights usually cause more trouble than they solve, even when justified.
2.) My boss - who finished in the money, btw - told me this morning that the general attitude around the table was that we were both being jerks the first time around, but that once the kid spoke up at the end and continued to talk trash after I had graciously accepted defeat and left, the table pretty much called him out for it and seemed to agree that the guy was a genuine asshole. This must have been the story that Alex heard and thus I am glad that I took the high road.
This is one time that it actually paid off to act like an adult!