Were you near blackbird leys by any chance.It's a good point, doing things like this can just encourage them to do worse things.
One time at about 6am I was taking my ex to work. On a miniroundabout, some idiot didnt give way and just cut across me, I gave my horn a quick toot, and he obviously took great offence to this, as he proceeded to jam on the brakes and crawl along at a few MPH on the empty road in town. He started indicating left and right, then turned down the street I was going. He continued to go slow and indicate randomly, then turned into an estate, which, thankfully, I didnt need to go into, so I just sped off to get away from the situation.
I will admit I was pretty scared, as I had images of him stopping in the road and getting out and after me. The ex was a little shaken too.
It's easy to get angry and do something in retaliation, but the person on the recieving end can flip and make the situation a whole lot worse...