שמות כב:כז פירוש: רש״י, רמב״ן, ספורנו ורשב״ם

אלהים לא תקלל THOU SHALT NOT EXECRATE GOD — Here you have the prohibition of blasphemy (the penalty being stated in Leviticus 24:16) and the prohibition of cursing a judge (who is also termed אלהים, cf. Exodus 22:7) (cf. (Mekhilta d'Rabbi Yishmael 22:27:1 and Sanhedrin 66a).

THOU SHALL NOT CURSE ‘ELOHIM.’ Onkelos translated it as referring to a judge, that one is not to curse him if he should hold him guilty in a lawsuit. Lo takeil [Onkelos’ rendition of the Hebrew lo t’kaleil — thou shalt not curse], is the Aramaic expression for “cursing.” Thus: “Meikal l’hu (they curse him): May the Eternal cut off to the man that doeth this, him that calleth and him that answereth.”³²²Malachi 2:12. — Yerushalmi Shabbath III, 7. There are many similar expressions, in the language of the Talmud Yerushalmi.

אלוהים לא תקלל, even though you may feel that the judge has judged you unfairly, you must not curse him. The reason is that no individual can judge his own guilt or innocence objectively.