The thought just occurred to me that on the whole, insults don't faze me very much. Most insults are like poorly placed blows, rolling off their target like water off a duck's back. These insults are typically uninspired and practically cliche.
Then, every once in a while, I get one that is much more...acute. Rather than sloppy swings at my psyche, they tend to be more similar to a steadily placed syringe, taking the scorn straight to the bloodstream. It ends up causing some kind of pseudo-chemical reaction, forming a thick, viscous ichor; pure anger. Really sucks, feels like battery acid being poured right down the back of your brain. It becomes a hilariously vicious cycle; I get mad, then I wonder why I'm getting so mad, then I get even more upset about how mad I've gotten.
But of course, the worst insults are the depressing ones because you know, deep down, they're true :/