Had a similar issue today. Riding on a windy road with double white lines in the centre going as quick as possible. The car behind was good and waited until dashes lines started again. I then signal right, car behind seemed to stay where it was so moved over. Then he went to overtake on a chevron section. I gestured to him but he kept coming then pushed me over. He was laughing and went off. Tempted to chase him down to traffic lights. He was in 60s too