NOT A TEACHER
Sometimes speakers use the long answer when they are angered by your question:
Tom: Are you crying?
Joe: No, I am NOT crying! Do you think that I'm a sissy? I just have something in my eyes. That's all. You had better not tell the other guys that I was crying!
Mona (interviewing someone for a job): How long have you been in the United States?
Maria: I came here in 1990.
Mona: Do you speak fluent English?
Maria (feeling insulted): Yes, I speak fluent English! ( = Why do you ask that question? Maybe because of my race?)