I live in California where lane splitting is legal. I do it often, but make sure I'm careful about it, especially when traffic is stopped and the space is tight. If i'm not sure i can make it through, I wait til cars start moving and space opens up. On my way to work the other day (on the few times where i drive and not on the Bobber) and was stopped at a traffic light, I see a guy on a Harley coming through. I tried to move over but since we were all stopped and jam packed in there I couldn't really move that much over. Also the car on my right was pretty close to me. I saw the space was really narrow (there's no way I would have tried to pass through on my Bobber which is much smaller than this guys bike) but he proceeds to squeeze through. I heard him make contact with my car, but as a fellow rider, I let it slide as I figured it was just a small tap with no real damage. When I got to work, I saw he left a nice 2" long deep scratch on the side of my car.
Here's a clip from my dash camera - in the video after he passes me, you can see he also hits this nice high-end Mercedes side mirror to the point where it folds forward, then also looks like he then bumps the other suv on the right. Once the light turned green, he just rode off like nothing happened.
This really ticks me off. Guys like this give all of us decent riders a bad rep. Riders like him are probably why a lot of drivers hate motorcyclists, as they've probably had their car bumped/scratched/damaged by guys like this.
I don't want to ever have any ill-wishes to anyone, especially a fellow rider, but I have to say that if he keeps riding like this, he is just inviting some bad karma his way.