You were in the wrong the instant you thought you had a right to the lane occupied by the motorcyclist merely by signalling your desire to change lanes.  Your request, your urgency to change lanes, and the motorcyclist's refusal to grant your desire are entirely irrelevant.  You stay in your lane until access to another is safe and granted.

Your thoughts of more violent response would subject you to jail time if acted upon, and if I were on a jury of such a case, I would put you there without much hesitation.

Violence is the last resort of the incompetent. 

And if you are concerned that I have some bias about it, I don't personally like most motorcyclists.