Lol, funny thing is - you're in NEW JERSEY.

1. Many people drive like assholes, it's what we do - and many out of staters f* up our flow - like PA drivers that drive the speed limit in the passing lane, causing bottleneck traffic jams.
2. The person honking was probably already late and wanted to make the light. They don't care about arriving safely or on time - all they see is the car in front of them NOT moving. Like a bird that shits on your car, it's not a complex mentality.
3. Ranting here isn't going to harvest much support because it's NEW JERSEY. The same asshole that laid on the horn would probably slam on their brakes if you were driving behind them too close.

Heck, I'll probably be downvoted to hell too - and I'm equally annoyed by people who overuse the horn, but, f* 'em - they're behind me and they can wait.