I like to think of other people as people with feelings.
Depends, am I squashed ? Do they stink ? Do they eat greedily and noisily ? Does their double chin wobble like jelly when they talk or eat which I find annoying ? If it's a short flight I will probably ignore but not possible long haul
I had the "luck" to sit behind a very large woman whose kept moving around in her seat, each time bashing my knees. I asked to be moved, but ended up having to swap with my wife (who's knees were safely out of reach).
On the return journey, I sat behind her even bigger husband!!!!!
The husband didn't bounce up and down in his seat, so I managed to sit without discomfort.....if you mean did I fell this is right /wrong etc, then if I had been in significant discomfort etc, I would have complained since I had paid a full price for "my share" of space and a reasonable journey. This person (for whatever reason) was taking my place / causing me pain - he I was not getting what I paid for.
I've seen this happen a few times on flights...on one flight another passenger was all like, "oh for crying out loud I'll switch seats with you (and sit next to the big dude) so we can get this plane off the ground...
I wouldn't demand ,buti would quietly ask if there might be a spare seat with a little more room
No. If it's a few hours of discomfort for me versus making them feel bad, I'll just deal with it. I would never demand anything. Now, if there were plenty of extra seats, I might consider moving but first let them know it's just so we both have room to spread out.
No, I don't. I think it's more likely that they'd turn to food more.