When Oedipus asks Tiresia to tell him who murdered Laius, Tiresia refuses to tell him. He says that he knows the truth but he can't tell him. So, Oedipus gets angry and starts to insult him in order to provoke him to tell the truth. Oedipus also accuses Tiresia of being the murderer and after that Tiresia is compelled to tell him the truth: that Oedipus himself is the curse, that he is the murderer. Oedipus gets even angrier after that and starts to insult Tiresia again and he also accuses him of having conspired with Creon in order to overthrow him.
As we can see, in both cases Oedipus's response is fury and anger, refusal to see the truth and also an attack to Tiresia.
