I'm often amazed by the holes in people's knowledge of popular music, especially stuff from my younger years that's now 50 years old. Of course, my ignorance of popular music from the 80s up is so profound that I've considered doing reaction videos to 90's-up "new" music that I've never heard (Old white guy reacts to your music...). My responses to rap and hip-hop would mostly be "What are they saying? I can't understand a thing they are saying!!"
I agree, her intentions are benign. And if you made a career out of opera, it wouldn't surprise me a bit that you were unfamiliar with a lot of popular music from 40+ years ago.