Please don't take this wrong, but it appears to me that you may be sharking yourself more than your opponent is. I'm not defending your opponent in this instance - incessant talking and movement in a tournament setting is clearly not good etiquette. However, poor etiquette doesn't always mean sharking. Your original post said it "feels unintentional", but your subsequent posts sound more like you are convinced he was actually trying to shark you. Is it possible that you are being hypersensitive to what he was saying and doing? I'm not saying that you are - just suggesting that you may want to contemplate that possibility.
I'm on a bar-league team that had a player for one season that let almost anything shark him. If his opponent or any other members on the opposing team were talking, moving or laughing while he was shooting he would see it as sharking, even though it is a bar league with no real money or prestige on the line. Most of the guys on all of the teams in our division are experienced and competitive players, but they are out to have fun socializing, too.
He was the best shot on our team by a good margin, but his game fell off steeply as soon as he perceived what he felt was a shark move by his opponent. And because it happened in nearly every match, he lost probably twice as many games that season as he should have. Now, to be fair, some of the opponents in that league actually do try sharking, but it is a relatively small percentage - like 4 or 5 guys out of 60 or so. Mostly, this guy was just beating himself by getting upset with phantom shark moves.
None of us ever brought that up to him because he was also very touchy about any criticism, but I think he at some level realized it himself because he opted not to come back to the bar league the following season. Instead he joined a team in the in-house league at the local pool hall where the etiquette was more tolerable for him and he's very happy in that situation.