Being a pilot with little experience (nearly 200 hours), I would want to get out of the way as safely and quickly as possible. I would assume either of:
1. He's got a problem and needs to land quickly so I need to take avoiding action. OK so he should PAN or MAYDAY in this case, but who knows what's going on in the cockpit. or
2. He's an arrogant S.O.B. so I need to take avoiding action.
For me, the priority is not to prove a point but to avoid physical contact. I don't know how long or wide the runway is or how far you had back-tracked, but my first inclination would be to stop immediately, preferably as far to one side as possible, then radio my position (so he can choose to go round). If possible, I'd turn round and give him as much runway as possible.
Once on the ground, I'd want to talk to the pilot, find out what he was doing and then sympathise or protest in the strongest possible terms.
What did you do?