The only time I honk when it's not an actual emergency is if somebody at the front of a right turn lane isn't making a legal right on red when there's no cross traffic. And it's mostly just a short beep to wake them up because they're probably just on their phone.
"History Is Much Like An Endless Waltz. The Three Beats Of War, Peace And Revolution Continue On Forever." - Gundam Wing: Endless Waltz