I was going to give my son a system, with brand new Solid Steel rack but he has AirPods???


AirPods and iPhones have replaced good 2 channel audio, it's criminal. They don't buy albums, CDs, or even the full album downloads. They've replaced my old 45s with mp3s.
I got him a Solid Steel rack and I can't return it, so what do I do? Sell it on eBay for local pickup or wait for him to get smart. You would think a mechanical engineer wants a Scoutmaster and a beautiful really well designed audio rack. I get he doesn't necessarily want my old Rotel amp and preamp, but I have a set of B&W CM2s on stands and he could get himself a home theater integrated amp and use the system to watch Movies at the least.
Where have we gone wrong?
128x128ctwith3
Ease of use and portability....When they are enjoying endless stream of music through AirPods there is nothing between them and the music.

And the alternative, dare i say most of us are so obsessed with extracting every ounce of goodness from our audio system and the lengths we go to accomplish that goal :-)
He doesn’t own a system and the first thing you buy him is an audio stand?  What teenager doesn’t like “furniture” as a gift?  
My kids love music, but they prefer to listen on their phone or in their car.  I don't want to try to force my generation's aesthetics on them or place a negative value judgment on them for their tastes and preferences in music.  Maybe that's where you went wrong.
Where have we gone wrong?

You haven't "gone wrong" nor has your son. Don't beat yourself up.

Maybe start with an Airpod "competitor" along the lines of the Sennheiser Momentum True Wireless 2 or their CX 400BT or another brand equivalent...so he can compare sound quality and figure out, for himself, if he values the differences.

All the best.