How would you handle this situation?

you're turning left onto a major thoroughfare which means you have to cross all lanes. While into your left turn, a new sports car is speeding down a side street and does not stop at the stop sign as if he is going to simply turn out into the same lane in which you are currently turning into.

He finally notices you and stops. You miss hitting the front of his new sports car by about 6 feet.

No big deal, right?

Wrong. At the next stop light, he gets right up on your bumper and starts revving his engine to get your attention. When traffic starts moving again he speeds around you and then matches your speed to simply stare at you.

You stare back at him. For about a quarter of a mile you two just match speed and stare at each other. Occasionally he speeds up and then slows down to once again stare at you, clearly a laughable attempt to intimidate.

At the next light, you roll down your window while staring at him. He immediately rolls down his window.

You say, "What's up?"

He says, "You almost fricking hit my car, dude!"

You say, "I had the right-of-way and you didn't stop at the stop sign. If anything, you almost hit me, brah."

He says, "Whatever dude, you almost hit my fricking car."

"Well, I had the right-of-way. I don't know what to tell you, man. From now on, perhaps you should come to full stops behind stop signs to avoid similar situations."

Traffic starts moving again and he starts matching your speed. Then at the next stop light just before he makes a left onto another street, he rolls his window down again and yells something like, "We'll meet again, mutherfricker!"