What does 2 Samuel 16:10 mean?

But the king said, 'What do you and I have in common, sons of Zeruiah? If he’s cursing, maybe the Lord told him to. Who am I to stop him?' 2 Samuel 16:10 - Modern Text Bible

(David stops Abishai, suggesting that maybe God allowed Shimei to curse him, and he doesn't want to interfere with that possibility.)