I know exactly where you are coming from and been there to many times. What is unlcear is whether you are riding your bike or driving a cage. I have had people do this to me while riding, I will be in the left hand lane actively passing traffic. Traffic is moving along well enough I don't feel the urge to split lanes and maintaining my 'bubble' with the traffic ahead of me and this jerk behind me flashes past and cuts in front of me because I left a car length and a half in front of me! Now I never try to cut people off while on the bike...losing proposition with a car or truck. But he did get a big thump on the windshield with the armoured glove of my left hand followed by the finger when I split lanes to just get the f*** away from him. Still dangerous but he pissed me off. In a car or truck, hell yeah...cut his a** off!!!