2 Samuel 16:7

Come out. Literally, “get out,” or, “go out.” Shimei took delight in David’s misery, and in his hatred cursed the king and told him to get out of the country.

Thou bloody man. When David desired to build the Temple the Lord told him that he would not be permitted to do so because he had “shed blood abundantly” and had “made great wars” (1 Chronicles 22:8). It is true that David had engaged in wars, but they were wars against the enemies of God’s people, and for the object of establishing Israel as a strong nation in the east. The wars of David did not at all prove him to be personally a ruthless or “bloody man.” As used by Shimei, these passionate words were a baseless slander (Patriarchs and Prophets 736).

Thou man of Belial. Belial means “worthlessness” or “wickedness”; a man of Belial signifies a worthless scoundrel (see on Judges 19:22). A wicked woman is called in Hebrew a daughter of Belial (1 Samuel 1:16). The word is personified in 2 Corinthians 6:15.

Shimei was a man of evil temper, and in these vilifications of David, was simply revealing his own evil traits.