On cramped planes android people get to sit next to apple people and feel buyers remorse up close and personal.
You don't even need a combination of an Android and Apple users.
Anyone can be remorseful that they bought a seat ticket right next to somebody who insists on using their media player at full volume, or talking loudly on their phone up until the last second possible, or trying to prop up their tablet behind their food tray so they can keep killing pigs while eating
It's almost as bad as those who turn on their smartphone displays while in a dark theatre.
(j/k ... yes, I know you meant being jealous of the other's device. I've seen that go both ways.)