It's good to clap to encourage performers.
Jones is at a concert with his friends and the band finishes a song.
Jones wants to decide to clap or not.
Jones claps for the band even though it wasn't his favorite song.
Jones didn't like the song, so he thinks the band is lucky he's not booing.
Jones friends clap for the song and the band as well.
Jones's friends think that Jones is being a jerk to not clap.