Duryodhana was so foolish that he dared to insult Vidura. This was due to his bad association with Sakuni, his maternal uncle, as well as with his friend Karna, who always encouraged Duryodhana in his nefarious acts

Expressions researched:
"Duryodhana was so foolish that he dared to insult Vidura. This was due to his bad association with Śakuni, his maternal uncle, as well as with his friend Karṇa, who always encouraged Duryodhana in his nefarious acts"

SB Canto 3

Saint Vidura was so honorable that his character was looked up to by all respectable persons. But Duryodhana was so foolish that he dared to insult Vidura. This was due to his bad association with Śakuni, his maternal uncle, as well as with his friend Karṇa, who always encouraged Duryodhana in his nefarious acts.

SB 3.1.14, Translation and Purport:

While speaking thus, Vidura, whose personal character was esteemed by respectable persons, was insulted by Duryodhana, who was swollen with anger and whose lips were trembling. Duryodhana was in company with Karṇa, his younger brothers and his maternal uncle Śakuni.

It is said that giving good counsel to a foolish person causes the fool to become angry, just as feeding milk to a snake only increases its venomous poison. Saint Vidura was so honorable that his character was looked up to by all respectable persons. But Duryodhana was so foolish that he dared to insult Vidura. This was due to his bad association with Śakuni, his maternal uncle, as well as with his friend Karṇa, who always encouraged Duryodhana in his nefarious acts.