Incomplete question. Here's likely the excerpt of the passage in "The Tell-Tale Heart";
"TRUE! - nervous - very, very dreadfully nervous I had been and am; but why will you say that I am mad? The disease had sharpened my senses - not destroyed - not dulled them. Above all was the sense of hearing acute. I heard all things in the heaven and in the earth. I heard many things in hell. How, then, am I mad? Hearken! and observe how healthily - how calmly I can tell you the whole story."
Answer:
the narrator is angered at the accusation of madness.
Step-by-step explanation:
Note, the narrator questions the one who accuses him of been mad twice. He said, "why will you say that I am mad?," to show that he (the narrator) is angered by the accusation he asked more likely with a loud tone of voice, "why will you say that I am mad?".
Therefore, based on this textual evidence it is reasonable to infer that the narrator is angered at the accusation of madness.