How would you have felt if it were the other way around? How would you have reacted?

I can say I probably would have reacted in a similar fashion to him except perhaps with a few less than friendly words thrown in. Of course I am not known for my healthy reaction to things.

There is a good chance he was running away from you. Possibly because he was afraid he would say/do something he would later regret.

The way he went about things was probably not the healthiest or politest way but it is understandable.

The answer seems to me to simply be that he was angry and so his actions in that moment were those of anger. We all know that anger is not the most rational or polite of emotions.