When I was about 15 I had a conversation with a guy in his forties about Bach's Goldberg Variations. Had to explain most of the basics: Johann Sebastian Bach was a guy who lived in Germany in the 1700s. He wrote this, uh, song for his student to play. It was commissioned by a rich nobleman at the time who wanted music to entertain him at night and who employed this student as a court musician. So this was Bach's student playing on the recording? No, he also died before recording technology was invented, but now modern-day performers play covers of the song, like in jazz. Oh, okay. [Despite this agreement I had to re-explain this point several times; the guy insisted he'd heard Beethoven conduct "Ode to Joy" once.] Isn't it weird that the student had a modern name like Goldberg way back in the 1700s? What do you mean by a modern name? I mean.... [several minutes of euphemisms follow, eventually leading to:] He was Jewish right? No, at this time Jews did not usually have surnames and were just named "Son/Daughter of [parent's name]"; this was a common German surname and Jews would later adopt it and others when trying to integrate better into European society. [Ok, I will admit 15-year-old me had the timeframe wrong on that.] Oh. You know, it's wild that we still have this song from the 1700s and know what it sounded like, from back when there were kings and aristocrats. Yeah, it's pretty wild. How long is this song anyway, it seems to have been going on for a while? It's about 80 minutes. Wow. That's insane. People were so different back then. He's really dead now? Etc.
Admittedly, this was rural New England and despite his age this guy had probably not been to college or even high school. But even people who have, didn't necessarily always take school seriously enough to remember much of what they learned.
In any case, I have no idea if he ever listened to any more classical music after this, but it was illuminating to understand the knowledge barriers people might face even if they do experience chance exposure to classical music and like what they hear.