1)
What is "Helitzuni"?
1.
Radak: They spoke about me and mocked me. Malbim - e.g. Shim'i [ben Gera] called him "Ish ha'Damim v'Ish ha'Beliya'al" (Shmuel II, 16:7).
2)
Why does it say "mi'Torasecha Lo Natisi"?
1.
Radak: Even though they mocked me for constantly engaging in Torah, I did not turn from it.
2.
Malbim: They mocked me greatly, even though I did not turn from Your Torah.
