Why bring Sigma Chi into your rant? There is no Sigma Chi chapter at Dartmouth and I can find no connection between Emily Sellers and Sigma Chi - let alone that she is Sweetheart.
Please either provide details to back up your connection between the two or apologize for besmirching an outstanding fraternity.
“The Sweetheart of Sigma Chi” is a song. I think the point was to draw a comparison between the mores of the era of the song, and the general vulgarity of Emily Sellers.