A long time since I personally encountered anything hostile beyond a honk of a horn. But a couple days ago a driver drifted over to the right and his passenger-side mirror hit a rider some distance ahead of me on our group ride on a perfectly straight, flat, and wide road. Hard to know if it was hostile intent or just carelessness since he sped off leaving only his mirror behind. The rider will be ok but has a broken collar bone and three ribs in addition to lots of cuts and scrapes.