I share your disgust. Once I was on a bulkhead coach 777 AA transatlantic flight (when they were still 2-5-2). I was on the aisle two seat area, with a nanny and baby in the window seat. Parents were in J. An acrid smell wakes me up and I see that the nanny is kneeling on the floor and changing the baby's nappies on her seat, next to me. This plane had nappy changing facilities (toilet with large fold down table). Filippino nanny ignored my protests. Flight attendant sympathised but did nothing. That I still remember this incident after all these years probably means I am still traumatised by it...