I can understand the FAA on this because calling them astronauts is akin to calling every passenger on an airliner a pilot and that's really all Bezos was, a passenger. But that's okay, Bezos has got plenty of money for greasing palms to get this changed.
I agree. Just like in aircraft, you can have "pilot" and "aircrew" and they are all generally "aircrew", astronauts should either be piloting the craft, or doing some job related to operations to be referred to as "astronauts". Bezos, et. al., were essentially passengers on a (really cool) trip.