I wouldn't say that what
@Glenn said is nonsense
@MarkF . My commute into work at 3:30am can be quite the experience although rare I have a fair few scary and un-welcomed experiences . Not the spray thing but here is a few.
Eggs thrown at me. Guy actually went up and down road twice to do this , I was all ready to phone police if came round again.
Driver deliberately coming head on at me x2
Being boxed in by 2 vans at set of traffic lights (looked like agency vans)
Van actually going fast enough over a Bridge to leave the ground for a good 15-20 feet. Fun to see kind of except he nearly crashed into a pub and hit the pavement and roadside I was on 5seconds before.
Had one driver come up to me fast and slam brakes on to cause a huge screech . Made me swerve onto pavement (luckily was a drop curb).
If and when I do shout at these knob head drivers I don't feel my swearing would have been the cause of this "escalation".
I will say though these incidences are very rare , over the past 2 years this is all I can recall right now as being exceptionally bad. But don't put it past people to do awful things and for no reason at all.
For any of your usual day to day incidences though its best to just let the person past and forget about it.