He's probably just a kid playing around with some cool technology and kicking off because he's young and over-confident (I'm sure many of us can relate to that - even if we weren't so foul mouthed).

One of the great things about the web is it evens the playing field for anyone to build tech. The cost of that is it becomes harder to spot someone with experience from someone who isn't.

In any case, I think you handled the situation far better than most would have.