Boarded IAH-SYD, my favourite seat 6D on 787-9. Lady in 6E wants me to swap with her husband, I quickly refuse, suggesting that she could swap with her husband’s seatmate instead. Immediate tantrum calling me rude. Not a millennial, at least in 50s. Her husband manages to switch up to 6B, and sits there & calls me a ‘tool’ many times. I then hear that they have children back in coach+ who have trouble with the AVOD & need personal attention. She made sure to tell me she was GS. I fear for the future.