Do you agree with me or my partner

We were in line for the car parking lot for the hospital and some guy drove down the opposite lane, right past us in the queue. You could see people in front of us waving their arms in anger and yelling to the person in the passenger. But my fiancé? He starts beeping the horn like crazy and his voice so deep and angry screaming what a dickhead he is. I was like "okay.... calm down.... Hes not trying to kill your cat". The guy made it to the start of the line and was refused access so he had to turn back around and drive past us all in the queue. I laughed at him for being a tool but my man opens the window, hangs his head and arm out and starts furiously shouting all over the road calling him a "f'ing w'nker" and a "prick" etc etc. meanwhile im sitting there, face purple with embarrassment like, was there a need??!!!!! His reasoning was that hes entitled to be angry as were all waiting to go to important appointments or see sick/dying relatives and that a-hole tried to jump the whole queue and its wrong. 
Maybe hes right but i cant help but think, maybe that man was desperate to get in, maybe it was urgent, maybe his loved one were getting their last rights, who knows? My man just gets too involved and kicks off in public for people causing traffic offenses or a bicycle rider going through a red light, he will hang out the window and beep the horn like crazy!! Its so embarrassing. So.... Am i right in minding my own business? or is he right in getting involved how he does? 

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