My dad let me grow up listening to whatever music I wanted to (went through a huge Backstreet Boys phase... don't judge), but still exposed me to all types of music. He exposed me to Metallica, Lynyrd Skynyrd (one of my few fond memories of him was the concert we attended to see them, or what's left of them), Led Zeppelin, and the like. Even if I didn't like them at the time (which wasn't the case because I have been listening to classic rock radio stations for most of my life), he still made me listen to them whenever I was in his truck.
My mom, on the other hand, is responsible for my love of soft rock music by making me listen to Billy Joel, Elton John, Bread, The Beatles (which really are in a category on their own), Carpenters, etc.
What I'm trying to say, with many parenthetical anecdotes, kids SHOULD know this stuff or at least have heard it... which is what I'm trying to do with my music classes this year. They need to learn or at least be able to deduce that Paul McCartney is NOT Jesse McCartney's father, and that Green Day has been around MUCH longer before they "sold out."
Baaahhh.... the world today...
TL;DR version: Kids need to get off mah lawn.