I don't know, the dude is well within his right to confront the cager and tattle tale to the cops, but this just seems silly, maybe the guy had a rough day at work, it happens to the best of us. I commute in the Bay Area, CA, with some of the worst traffic in the great US of A, and if I were to flip out over every little thing like that, I would have burst a blood vessel or two by now. What's the point? Majority of the cagers are bad drivers, why take it personally? The whole point of getting a motorcycle for me was to be more or less independent of other drivers ignorance, such as people who block the right turn lane even though they are going straight, or, my favorite, ignoramuses hogging the left lane, driving parallel with some other ignoramus in the right lane, completely oblivious to a traffic pile up behind them. These are not bad people, just bad drivers, go around, or stay behind, but don't be surprised when they don't see you.