Free: Contests & Raffles.
Sounds like you guys are trying to hunt the same area. Still doesn't give him the right to mess with anyone's camera. If I were you I would just take my camera down.
Public land you just got to roll with the punches. I for one have to much respect for my fellow hunters space. If I see someone is set up in an area I wish to hunt I will not crowd them I'll move along.