Rider was in the centre of the lane. (Kings Way, Sth Melb) Rider and cars doing approx. 40km/h. As I approached from 2 cars behind, saw the rider was steady and remaining on the same path. After I split between the rider on left and car on right, looked back when I heard a horn, and the rider was giving me the bird. Would have been more space between me and the rider, than normal between me and a car. Have split past bikes at least a few dozens times in many years, and never got that, or similar response before. Anyone else gotten similar when splitting past bikes?