Earlier quoted context omitted.
> flipping off the drivers if they honked 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.
This is not true in the US, at least in Washington state for example. Honking = speech 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.