Your post reminded me of something that happened years ago to a friend of mine. He had to go into London for some reason on the train. This was unusual as he normally rode his motorbike. Anyway, he had to go in on a commuter train, so climbed aboard, found an empty seat and sat down. At the next station an attractive young lady got onto the train and came straight over to him. He looked up expecting a smile, and instead found himself on the receiving end of a loud diatribe about sitting in 'her' seat.
He was rather nonplussed by this, as train seats on commuter trains are not bookable and he reminded her of this, and he just sat there bemused while she berated him loudly for all the carriage to hear. Eventually she shut up, and he pointed out to her that there were other seats available. However, she then started again, insisting that the seat he was occupying was hers and that she 'always' sat on that particular seat.
He chose to ignore her after the second outburst, but was rudely brought back to the situation when she sat on his lap! She remained there for the duration of the journey, and he told me that he found the situation absolutely bizarre, but being him, and rather stubborn, he refused to give in to the lady, and sat there stoicly putting up with her weight on his lap until one of them finally got off. I can't remember if it was him who got off or her, but I do remember his incredulity at her entitled attitude.
This happened when he was in his late 30's or thereabouts, and the young lady must have been in her 20s.