But when you find yourself in an uncomfortable group situation, it’s good to ask how you can make it better for everyone, or at least not worsen it. “I paid so I’m doing whatever it takes to not inconvenience myself in the slightest” is the origin of “this is why we can’t have nice things”.

It’s different when there’s a compelling physical need here. If the person in front of me has a hurt back and can’t bear sitting upright, and I knew about it, I’d put up with it as best I can in the interest of we’ve all got to get along. But in the scheme of things, not that many people are unable to sit up and not crush their neighbors.