Dislaimer: I rarely use my horn. Sometimes go weeks without using it.
However, I do understand the NYC residents (its not limited to BP, at all). Finding a parking spot can easily take 10- 20+ minutes, which causes people to double park. DP causes the already congested streets to be barely passable. It can take longer to walk a shorter distance than to drive it.
The slow enough commute can be quite frustrating, and almost every intersection is busy. Add a car blocking etc, people will honk.
Then add the pedestrians. Who waits for a walk signal? That’s another cause for more traffic and –honking