新概念2.1-a private conversation

why did the writer complain to the people behind him?

last week I went to the theater. I had a very good seat.

The play was very intersting .I did not enjoy it.

a young man and a young woman were sitting behind me. they were talking loudly.

I got very angry. I coud not hear the actors.

I turn round. I looked at the man and the woman angrily.

they did not pay any attention.

In the end, in could not bear it.

I turned round again.

i can't hear a word . I said angrily.

It's none of your business. the young man said it rudely.

this is a private conversation