I remember being little and my parents having guests over, I'd always have to tidy my room within an inch of its life, then get kicked out of it and sleep on a blow up bed in the hallway so the guest could have my bed. The guest would usually be one of my aunts, an adult woman who imo as the guest, should be the one on the sofa or blow up bed.
I remember getting packets of sweets at christmas or for my birthday, and being forced to offer them around before I could have any, and everyone would take giant handfuls until there was only about 2 left.
If I was on the sofa and an adult walked in, I was expected to immediately move to the floor so they could sit down (even if I was there first!) And we are talking healthy 30 somethings, not people who actually need the seat due to sore backs, arthritis, etc.
I've spoken to other people my own age, and my experiences seem quite common, so I'm just wondering why people seem to think kids should bend over backwards to accomodate them, just because they're kids? I'm not sure if this is such a thing anymore, but I would never dream of kicking my children out of their rooms for guests.