We're constantly being bombarded by insulting and humiliating music, which people are making for you the way they make those Wonder Bread products. Just as food can be bad for your system, music can be bad for your spirtual and emotional feelings. It might taste good or clever, but in the long run, it's not going to do anything for you.
The difference between real material poison and intellectual poison is that most material poison is disgusting to the taste, but intellectual poison, which takes the form of cheap newspapers or bad books, can unfortunately sometimes be attractive.