Honking within urban areas is forbidden unless used to prevent immediate danger (well, in France anyway).
Honking for "educational purpose", ie to yell at someone, is a major nuisance. Every honk annoys dozens of people around the driver, wakes up babies and so on.
Friends, don't let friends honk inconsiderately.
https://law.justia.com/cases/washington/supreme-court/2011/8...
The Pacific Northwest has always had a libertarian streak, I doubt this would be ruled permissible in other states.
Aside: I really wish cars had two different horns. A nice little boop horn, to say "hey I'm here" or "lights green buddy" and then the big honking thing that says "you nearly hit me by rolling through that stop sign, pay better attention"
I really wish cars didn't have horns. Or that horns would be louder inside than outside for drivers to "feel" it accordingly.
99% of the honks I hear are useless to prevent any incoming danger (too late, honking to say "hi", honking to express displeasure...)
I've used the horn once in the last 10 years, and I shouldn't have.
It is used a lot, but without actual benefit IMHO.
Edit: perhaps less useless since drivers tend not to look before changing lane. That's another issue.