I didn't react aggressively towards the Civic driver even though I was in the right. I was on the way home then when misfortune made us cross paths. At first I wanted to raise my voice (which would certainly have made him angrier) then I remembered a close acquantance of mine who's life was changed when he killed a fellow driver over a traffic altercation similar to what I was experiencing at the moment. What I did was to explain my position to him, but he would have none of it, continuing with his "lecture" on proper "merging" hehe, I still have faith in karma...