What’s infuriating is that it’s an act/character he puts on for the evening drive show with Felger. I haven’t listened to either their show or WEEI in years, but it used to be very apparent when the baseball writers show was on immediately after Felger and Mazz; he completely dropped the schtick and actually had decent insights on the Red Sox and baseball in general. Felger and Mazz are just total bozos trying to take controversial stances for the ratings. And it’s annoying as hell when you just want some decent discussion on local teams instead of “entertainment”

Rockwool and spray foam accomplish the same thing- both will help deaden the sound waves, but they will still transmit through solid members i.e. wood joists, strapping, wall plates. Air gaps and multiple staggered layers of decoupled sheetrock (resilient channel and sound clips create air space between layers and eliminate hard connections) are probably the way to go- and likely what a sound engineer would spec. You’re looking at $30k easy. And probably wouldn’t be happy with the results. Getting new neighbors would be more effective