I thought they were just being old codgers, but now I'm thinking along those same lines. That the music we listened to back in our day (60's and 70's) reflected more of a moral structure than what we hear these days.
Seeing the lyrics of some of the songs now, I can see what that post is pointing. Music before expressed more about life and offered more meaning. Indeed artists have different approaches, but we know more important things to put in our song.