alt Hacker NewsIt's not unreasonable to expect certain behavior in a shared space.
I'm really not sure where some of the other people replying to your comment are coming from. Forcing every human and animal you come across to listen to what you're listening to is selfish. Full stop. And not doing it costs $0, which preempts any question of resources.
Sometimes I would really rather not have the outside world isolated or noise cancelled while I'm listening to music... so I sorta get it?
But also, for all the reasons described, I just use transparency modes if I want that. That way nobody else has to hear my poor taste in music.