@snilf ...be happy he's listening....and 'junk' is subject to taste & budget....
Better 180 g. lp's than a gram or so of the 'alternative alternatives.'....although there's that when stuck into a micro-manse'.... ;)
'Better' is so wrapped up in preference that it becomes almost preaching to the choir (esp. here ) when one wants to debate that into the same degree of oblivion...
One listens to what one prefers.
You are what you eat, even if it's through your ears.... ;)
Embrace son-in-law...he's young. That, in itself, makes a huge diff in this era of earbuds and 'questionable electro-devices' that deliver it into ones' head.
Irrational is a POV.
You've yours, I've Mine. I can argue you into a corner over it. And so WTF is the end game for you and me.
Gift him with what you feel is the 'better alt' is my suggestion...he's family now, has the attention of your dau, so...better to try to love 'im than the alt, Right?
...unless you just Have to be the Grinch...😏