I will give the parents credit for at least asking beforehand if the airline could accommodate their awtards and the airline was pretty generous to allow them to bring their brats in for a "dress rehearsal" as far as going through security. Tards do love routines, so this was pretty cool on their part.
However, I don't think the airline staff was in the wrong. Sounds like one of the tards started having a meltdown for some dumbass awtard reason like he didn't like the way his left sock felt or the floor tile looked at him funny, the staff recognized this and decided to stave off giving an entire aircraft full of passengers refunds.
Not to mention that Tard Boy would probably have serious issues being strapped into a seat and expected to stay still when he was already melting down. The agent probably saw their career flash before their eyes imagining Tardley unbuckling his seatbelt and becoming a projectile during takeoff, after which someone in management would be asking why the fucker and his handlers were allowed on the plane in the first place.
It's most likely not that they don't cater to disabled people, but just that they aren't going to let someone on a plane who might cause problems that could result in an emergency landing or turning around, regardless of mental stability. Awtards are not an exception to this rule, either. The airline is committed to disability inclusion, but that doesn't mean tolerating potentially violent tard tantrums at 35,000 feet. I think that agent should be commended for seeing the writing on the wall and saving the rest of the flight from a screech-tard.
The airline spokesperson said, "The American Airlines team is committed to providing a safe and pleasant travel experience for all of our customers.” I'd wager that this means they also need to take the needs of the entire flight into consideration and not just one person or one family. Tard Boy throwing a tantrum before they even got on the plane did not bode well and you know he'd be in full raptard mode by the time they were off the ground.
Being tard parents means you can't do certain things, and not everyone will smooch breeders' asses because they have awtards. Airlines are insane about security and if they think you might cause even the slightest disruption, you're not getting on the fucking plane. Give them a refund, absolutely, because they didn't get to take the flight they paid for. Sounds like the parents didn't want to be stuck in a car for X number of hours with three normal kids and two awtards, so they figured they'd fly, let the brats run loose on the flight and they'd be everyone else's problem. Yeahhh, planes aren't like restaurants and doing that shit is a good way to get booted off the flight.