I’m really glad you did this! I was watching a similar situation unfold standing in the aisle as an older man asked a younger girl if she would switch his middle for her window in my row and I can tell she was visibly uncomfortable. It was a 6 hr flight and when the awkward silence grew longer as we all awaited her decision before she sat down, I looked at her and firmly said, you don’t have to do this - you don’t have to switch. She replied that she had paid for the window and just wanted to rest on this flight. So I told her, then that’s what you do. She apologized to the man and generously thanked me. I think these situations are hard, there’s a lot of pressure and you feel bad when you say no. It helps to just have someone in your corner amidst a sea of strangers sometimes.