if someone honks at me and I'm not very far over in the lane, I move left a little. And wave. That lets them know I'm doing what I'm doing on purpose and I know they are there. I have had people honk at me when I'm in the right lane of a 4 lane road where we are the only two vehicles in sight. They just don't know how a bicycle should be safely operated. If they see you riding a lot they'll get used to it.