There's no explaining that kind of crap. Sometimes it's just someone who doesn't like that you are going faster than them. "Oh no you ain't gonna pass me!"

I have a couple of similar stories:

I was behind a Dodge Ram dualie with a full load of furniture in the bed going slowly on some backroads. I went to pass him on the left, over a broken yellow line. (I was in my Boxster.) When I got next to him he floored it. That put me in real jeopardy even though there were no oncoming cars coming. I was able to complete the pass but not before I hit some high speeds. A nice CHP officer happened to see the tail end of it and we had a chat about it.

The other day I was in my work Taurus and passed a lady in an E class. I was going maybe 50. As I passed her she honked. I didn't react at all because I didn't think it was directed at me. She later tried like hell to catch up to me after the next light she got caught at. When she passed me she shot her arm out the window and gave me the finger. I'm embarrassed to say that she got a mouthful from me when I caught up with her.

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