yes it is shitty lyrics but you can't tell a person how a song or anything is supposed to affect him. i am no fan of this music and i would for sure make fun of him for listening to it but to try and tell him it is not allowed to affect him is silly.Really??
if me and you were standing in an art gallery looking at the same piece of artwork. we are going to have 2 different interpretations, i can try and convince you mine is right and you can do the same but the reality is that it means something different to each of us. he likes the song and thinks it's deep (probably as deep as the cock in his ass) that is the beauty of music and art, it will always do something different to different people.