Actually infoman with the growing amount of electric and hybrid vehicles on the road, sounding one’s horn is becoming increasingly common as a warning to young people (often with earbuds in) are completely oblivious to cars both in the road, coming on and off driveways and in car parks.
I have used mine on several occasions to alert pedestrians (not always of my presence but that of other vehicles) and when coming across other vehicles in car parks who appear to have no spatial awareness or become blind to other cars and pedestrians.
as only fools beep their horns to vent their angry on another motorist, because they feel they have been wronged by another motorist.
Then I am a fool!
I beeped my horn the other day at a motorist, who reversed quickly out of a space in Sainsburys, without checking. She was oblivious to the fact that I was inches away and almost went into the side of my car.
I was definitely angry at her reckless driving, but the main reason was to alert her to the fact, that I was there! .