They don't
have to be about music, no, but really, if you come across a website called "Music Banter", it's not unreasonable to expect there to be, well, banter about music.
Naturally, in an ideal world we'd all want to share our problems, have them shared and supported, but there are ways to do that. As I said, it's the method --- he doesn't even choose a name: what is this? Prince mark two? --- he uses that elicits, I believe, this largely negative and ultimately uncaring response. It's tough to take a look inside someone's heart or soul, especially when they're saying look how dark it is in here, but not offering you a torch, or even carrying one themselves. Hard to want to keep going forward under those conditions.