I don't understand why a passenger with a certain need wouldn't be proactive in taking care of themselves. If they need to sit in a certain seat to ensure that they can carry oxygen, they should book that seat.

If someone wants to use a laptop on a plane, he/she reserves a seat with a power port. If someone wants a window seat, he/she reserves it. If someone has an issue and most go to the bathroom frequently, he/she books a seat close to the bathroom. ETC, ETC, ETC

I don't think that this issue has anything to do with disability...it is simply that someone wasn't smart enough to use the resources at their disposal to ensure that their needs are met during the flight. These types of people show up at the airport and expect a red carpet. It disgusts me.