He did what Jehovah considered evil the same as Ahab's family had done. After his father died, they advised him to do what Ahab's family had done. They did this to destroy him.

The one who walks with wise men will be wise. A companion of fools will be destroyed.

After the death of Jehoiada the priest, the leaders of Judah went to Joash and talked him into doing what they wanted.

My son, if sinners tempt you do not consent.

The thoughts of the righteous are just. The counsels of the wicked are deceitful.

Stop listening to instruction (discipline) (correction), my son, and you will stray from the words of knowledge.

Treasury of Scripture Knowledge

Summary

Wherefore he did evil in the sight of the LORD like the house of Ahab: for they were his counsellers after the death of his father to his destruction.

Bible References

They were his

After the death of Jehoiada the priest, the leaders of Judah went to Joash and talked him into doing what they wanted.
My son, if sinners tempt you do not consent.
The thoughts of the righteous are just. The counsels of the wicked are deceitful.
The one who walks with wise men will be wise. A companion of fools will be destroyed.
Stop listening to instruction (discipline) (correction), my son, and you will stray from the words of knowledge.
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