Urgh, what a jerk! I've had some encounters with jerks in cars before, but like you said, I'd think a motorcyclist would be more apt to share the road. Both because they're fellow two-wheelers, and also because they have so much more room to maneuver around you than a car does. Sorry you had to deal with that, and I hope you don't have any more encounters like that.

On a more positive note, congrats on conquering The Hill! Gotta feel great about that!