Great story, but based only on this tale, I don't think it's fair to call him a "prick." Misinformed or ignorant maybe, but not a prick. He saw what he perceived as illegal activity going on in his neighborhood, so he reported it. Nothing wrong with that. If I saw someone ACTUALLY distilling, or cooking meth in their garage, I'd report it too. If it turned out he was just making his own cough syrup, does that make me a "prick," or just ignorant regarding the techniques and equipment involved in making your own cough syrup?
That said, I doubt this was an isolated incident, and I'm sure you have other perfectly good reasons for forming such a negative opinion of this particular neighbor.
2nd time he has called me making beer in my front yard. He also dumped my peace offering beers in front of me. As well as calling "code enforcement" because my boat and trailer were on my driveway and not on the side of the house(trailer tongue has to be behind forward most facing wall of house) Only enforced "IF" someone complains. So I may be a bit jaded. He has since tried to petition my other neighbors to make it illegal to make alcohol in our area(lucky were not in a HOA) I heard that he only got 2 signatures out of the 36 homes in our subdivision