In no situation can you just throw at a person. See any of the great posts above that have several likes.
On second thought, just to contradict myself, I've done it once myself though. "Urban disc golf" competition, completely on the up and up, squared with the city and all, safety measures, all things considered. Couple of inebriated guys set up shop on a bench* quite close to a basket outside of the circle I think but still there. Event staff people ask them to move, they refuse. Didnt feel quite right though but we played the hole (230ish over a river). We must have felt like nothing we can really do. (well, I guess every player could have forfeited the hole, take a par?). I dunno.
What would you have done?
*memory cant recall if the bench was taped not in use, I would like to think so, but cant me sure