It's a joke and at the same time it's not.
Isn't it ironic how the most typical casual greeting formula, aiming at establishing a friendly connection to the other, can be like a torture -- exactly because no honest answer is expected.
I wish we could normalize saying "Hi! Good to see you!" instead.
"How are you doing?" is so ambiguous it borders on redundant. It's also just so drawn out, it's like playing tennis with prepackaged words.
At least with "Hi, good to see you", you can quickly convey how engaged you are without being rude or weird. "Yeah, you too" would be a polite "not in the mood to talk" reply, while a "Good to see you too!" would be more friendly and sociable.
I'm not even autistic and I hate this linguistic game.