Since this is your regular route, I would give him a break. It is possible that he doesn't realize that this bothers you (hard to believe but true).

For the next couple of times you see him, make it a point to say "Hello" or "Good Morning". His reaction will allow you to determine if he is good natured and dumb or malevolent.

If it turns out he does this just to annoy you, then I would report him.