What does 2 Chronicles 19:2 mean?

Jehu, son of Hanani the seer, went out to meet him and said, 'Should you be helping people who hate the Lord? Why are you making friends with those who oppose God? Because of this, God’s anger is against you.' 2 Chronicles 19:2 - Modern Text Bible

(A prophet confronts Jehoshaphat for teaming up with a king who opposes God, warning him that this alliance has brought God’s displeasure.)