Who's being reasonable/unreasonable in this situation?
Large airport departures (not the gate). Unmovable lounger type metal seating arranged in pairs in front of huge window where you can see the planes. Every seat is taken. Couple in their twenties are using one of these pairs of seats. One half of the couple decides to go and have a mooch round the shops. They leave the seat empty but a suitcase at the foot of it to show it's 'taken'. Woman in her thirties comes and sits down on the free chair. It's very clearly part of the pair of chairs and the individual sitting on the other tells her it's 'in use' and is not happy about having this stranger sit there invading her space - the woman in her thirties says she's exhausted and will leave when the partner comes back. They sit there awkwardly together on their phones until the partner comes back about 10/15 minutes later and the woman in her 30s leaves.
Who, if anyone, is being the cheeky fucker here?