Since I moved to London, I've noticed it's really common for people to play their music out loud in public. I've experienced this in hospital waiting rooms, when having a picnic by a river, in parks, on the bus, on residential streets... It just strikes me as hugely presumptuous to assume everyone wants to hear your music. Why can't people use headphones? What if I were to play my music loudly over the top of theirs? Why do people even do this? Music is highly subjective - you can't assume others will enjoy what you're listening to.
I've noticed it's normally tolerated by others, however, so am I the one who's being unreasonable here? Or is everyone just cursing in their head but we're too passive aggressive as a nation to actually say anything?