I have just had the opposite situation - me asking repeatedly to give up my better seat!
I landed an hour or so ago in Vienna. I sat in 1D, very nice elderly American gentleman in 1F. He mentioned his wife was in 6A but they’d agreed as he was tall he should be in row 1. I went back down there and asked if she would like to swap - she said no, she’s got herself organised and was perfectly happy there - doing a jigsaw on her IPad.
I poppedback a couple of times on the flight to repeat my offer, but to no avail. Upside for me, I spent 2 hours talking to a complete gentleman who was very different from me but utterly charming - a real life enhancing couple of hours.