It doesn't have to be repeated because it isn't the point of the story.

A song does not have to be from a particular era to evoke a response. This song has developed an image, primarily through media, and it does evoke a response.   You don't have to agree with the reasoning, I'm not sure if I do as well. However I do respect the individuals reaction and believe that the school had the appropriate response.

The issue is still a matter of respect and situation.   The song was not "banned", the song was pulled from a concert but discussed elsewhere in the school.