Watched the whole thing while having a sandwich my girlfriend. Whats funny, or really not so funny is that the same guy went off on another bunch of guys just two weekends ago, but he didn't pull out the chainsaw that time.
I lived up there from 8 to 19 yrs old. and for the most part the locals are pretty cool. Yah, the number of bikes on the road has gone way up in the last 20 years. But, it's not like it was when they had all the dirt bike clubs running in the canyons with un-silenced two-stroke expansion chambers. God, you could hear those things MILES away. The locals hate those a lot more than the street bikes.
That being said, there are still a fair number of social outcasts living out in deep dark places. They seem to hate everyone!!! including their neighbors. They usually drive these old piece of crap 3/4 ton trucks loaded down with various pieces of hardware.
Those are the ones you might want to think twice about before passing. I wouldn't put it past them to try and knock you off going through a corner.