Showing My Age?

I went to a Fleetwood Mac concert this week. Red and I got to spend some quality time together. We were at a bar before the show, and this man behind us asked us who was playing. Red said, "Fleetwood Mac!" He said, "I don't know who that is!" I turned around and asked him how old he was!?. . . ."33!"
I felt a little insulted, as I thought he was suggesting that he was younger than I was. Really, he was just showing his lack of intelligence. EVERYONE knows who Fleetwood Mac is, right??