Jareth was caught by surprise when the pirate ran into him, he was annoyed that he let himself be caught of guard like that as he stumbled back, shoving the pirate away from him, and away from his necklace, though oblivious for the moment of the Pirate's actual intentions, "Watch where you are going!"
He sniffed in distaste, nose crinkling at the smell of the man, "Though by the smell of you, you are likely nearly to drowning in your cups..." He steps further away yet, muttering something about 'filthy pirates' as he does, and watching him carefully.
"Who are you, anyway..?" The unspoken addition of 'so that I may avoid you in the future' implied in his tone.