No wonder the pool world is so screwed up. Most people in this thread are of the belief that after you get cheated and screwed, you should offer a handshake otherwise you're the scumbag. What kind of self-loathing logic is that? Should a woman offer a hug and goodbye kiss to her rapist? C'mon people.
Not shaking hands has multiple purposes and has nothing to do with bad sportsmanship. In fact, it's good sportsmanship. It's a protest to unethical sleazy play. Want a handshake after a match - play like a true gentleman. Works both ways. Also, a handshake rewards it all by putting it in the past. As if to say all is well, you got away with it. A form of sanctioning. The reality is, the winning player, like most pool players could care less. If anyone would ever have a gripe over this it would be the player denied the handshake. But this rarely happens. Most pool players are of the mentality "I'll take the cash, you can keep the handshake" ..
Anyhow, by not shaking, it becomes remembered. It's like tagging something with a flag. The cheated player gets to taint the cheater's win. It publicizes the fact there was a controversy of some kind in the match. Thus, not necessarily being a clean win.
On the other hand, people who don't shake because they are bitter over a loss - they are poor sports. But that's not the situation here.