That is quite......well......what do you say to that...?
I applaud your patience though, I think my temper would have had me tapping their window and pointing out what an utterly abysmal driver they are.
I did once have to stand in front of a woman reverse parking, showing her which way to turn the wheel.
She was completely baffled by left/right while reversing.
Her daughter got out of the car and stood covering her face in embarrassment.
IME it's a fairly common thing with women drivers, they just cannot work out which way to turn the wheel when reversing. You see it regularly in car parks, backwards, forwards etc and you're itching to go and go it for them!