Yeah, loneliness may be one issue, but I think this current objectionist movement is driven by anger (we live in the age of outrage) - the feeling that someone else has access to something they don't have access to.
And it's so unnecessary - for example I don't appreciate fine champagne, but I'm comfortable that I will never have these (apparently) enjoyable experiences that others have when they taste different levels of the stuff. And I don't jump on a forum called champagnesciencereview and share scientific measurements asserting that beyond a measurable limit, all champagne tastes the same.
Similar deal with rap music. I don't appreciate it, but I'm happy that others do, and I don't try to prove them wrong.
Similar deal with spirituality, etc. etc.
A positive point on this subject is that after years of me suggesting to a family member how best they might integrate a good quality sound system into their family room, they finally said to me - look, we now realise we're not audio buffs, and we can't hear much difference between different systems, so we're happy to just use a B&O sound dock, as it fits in with our decor.
Bravo. Live and let live.