Hello Oomis,
Yes, I did misunderstand you about meaning only classical music. Dr. Gottleib of Ohr Sameach listens to classical music, so you are in good company. My comparison was rap and Loshon Hara.
As far as BT’s dating FFB’s, I still disagree with you. Perhaps after she stops listening to rap, she could think about dating an FFB. Until then, the chance of her getting the respect and admiration of an FFB is very small. The chance of her getting the respect and admiration of his parents is close to zero. She is better off finding somebody who wants her to melt (pareve) cheese on his hamburgers – and who will support her when she wants/needs to listen to rap. Hopefully, they will grow together.