Is it REALLY a surprise that a teen isn't too well versed on high end audio/video components? It's not like those people exactly have the income that allows them to experience better quality stuff.
I have a pretty nice home theater right now and I can assure you that when I was 18, 19, 20 years old, that was absolutely nowhere near my thought process of "I need to buy this soon, it's important."
Kids aren't going to discover those things when they're kids..........because they're kids. They are happy enough with just the ability to watch movies, steam video, or whatever, whether or not it's in high quality 1080p and/or uncompressed audio doesn't rank too high up on their list.
As you get older (and hopefully more successful,) those things become more of a curiosity to you.