It's wrong to lie to others about things you like.
Carl is getting to know a girl he just met, and they are sharing interests.
Carl wants to make a good impression on the girl.
Carl expresses some interest in listening to her favorite band.
Carl says that he likes her favorite band when he's never listened to them before.
The girl is excited because he seems open to listening to her music.
The girl finds out that he lied, and she loses interest in him.