Sounds like the matter is fully resolved. Failure to dim is on the long law enforcement list of possible drunk driving clues. You say above that you dimmed after he flashed his lights. He must have been looking for something, and being out late often makes officers curious.
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I'm sorry that the officer wasn't more cordial to you, but try not to take it personal. He might have been kinda bummed that you weren't drunk! As far as the ticket goes, if you had to be reminded by another driver to dim your high-beams, it means that you hadn't dimmed them when you were supposed to (before they effected another driver's vision). There is no law that requires anyone to be respectful of others, although sometimes I think that we could use it. However, on the other hand, it doesn't sound like you would've won on the ticket anyway. Tough break. Have a good day.