Person A is pretty unsociable. She gets on the bus and looks forward to time alone to sit and think/daydream during her 1 hour journey.
Person B is sociable and looks forward the her 1 hour journey to chat.
Bus has lots of empty seats. Person B decides to sit next to Person A and try to strike up conversation. Person A is polite but makes it obvious she doesn’t want to talk. Person B is a little offended and thinks Person A is a miserable sod. After a few more attempts to make light conversation, person A moves seats. Person B now very upset and this plays on her mind all day.
Let’s say Covid isn’t a thing.
Who is unreasonable?
YABU - person A could have made more effort, it wouldn’t have killed her to chat
YANBU - person Bs wish to socialise doesn’t trump person A’s wish to not socialise