It was the first day of English class and the teacher was introd

It was the first day of English class and the teacher was introducing himself. He wrote his full name, Alan Jones, on the board and said,"My name is Alan Jones. If you like, you can use Mr. Jones’. Now Id like you to tell me your names. Let's start with you," he said, indicating a young woman in the front row.
The young woman answered,"My name is Liliana Castro, but you can call me Lily, Teacher."Then the teacher said,"OK. I’ll call you Lily, but please don't call me"Teacher’. Please call me Alan or Mr. Jones."Lily looked confused, but the teacher ignored her reaction and continued to ask the students to introduce themselves.
Questions:
Why did Alan Jones ask Liliana not to call him "Teacher"?
【正确答案】：Because in English one seldom hears English speakers addressing others as Teacher. In English only a few occupations or titles are used, and ‘teacher’ is not included.