I am starting to be the same way and I'm not sure if it's a good thing or not. Car turned out in front of me on a 45 mph road and I would have ate her bumper if I don't hammer the throttle and go around her. Heart was racing for a second but within 10 seconds I was fine, pissed off, but fine. Heart rate dropped and I didn't really think much of it after it happened. Although after reading my own post, maybe you and I are not desensitized to stupid drivers, maybe we are just more prepared for them so when shit does happen it doesn't catch us off guard.