1)
Was he a mockery only to his nation?
1.
Rav Sadya Gaon: "Ami" means nations. Rid - this is like "ha'Roded Ami Tachtai" (Tehilim 119:20).
2.
Ibn Ezra #1: Yes.
3.
Ibn Ezra #2: "Ami" includes nations under me, like "Es Amalek v'Es Amo" (Shemos 17:13).
4.
Ibn Ezra #3, Ri Kara: The Yud in "Ami" is extra (it is as if it says l'Chol Am).
5.
Palgei Mayim: When I prophesized evil to them, I was a mockery to them. This brought the evil upon them!
2)
What is "Neginasam"?
1.
Rid: Their songs and joy.
