Ballini - are yes the dis-courteous drivers. I have taken to acknowledging them when I let them threw is as pronounced a way as possible. I'm sure they are just oblivious.
One guy breezed past locally , no acknowledgement in an 'Well I own the road' expression two days in a row'. I acknowledged him but he wasn't taking the hint. Came across him again three days after that and this time I carried on to see if he would stop.
Of course he didn't so we came bumper to bumper. He wasn't going to back up, so I thought 'b*ll*k*s. Turned the engine off, got out of the car, locked it and walked off, leaving it in the middle of the road (narrow with two lines of parked cars so you can't get two through). A little petulant but the look on his pace was priceless. He then just backed up to a turn and had to turn around and go the other way. 
I waited around the corner out of sight, didn't want him to think I might be coming back, then went back and drove home.
Of course it was a judgement call as to whether he was rude or a psycho. I or the car could have been attacked but there you go.
