Two times this week somebody has called me this.
Both times were because somebody could not get around me while i made the delivery.
I followed up with the usual 'you got a problem!'....while raising my arms in a 'bring it' kind of way.
The first guy kept on driving, but the second guy had some crazy in his eyes. I could see it as soon as he slammed on his brakes and exited the car.
Long story short. He never did see it my way, but at least i was able to talk him out of fighting on the side of the road.
There are people out there who just DONT care. Be careful.