Autism is only not a disability if you manage to also get the mental capacity to adjust by using sheer cognitive power, reasoning your way through life and using most of your cognitive ability during school life to build this huge internal encyclopedia of human social behavior so you can quickly apply the best "reaction" in all situations. I can tell you this is pretty mentally taxing in the long run, not to even mention the countless failures in the beginning and the willpower required to keep up the motivation to even attempt this level of "social adjustment". It also can make one fairly angry at the universe once they realize that is what they have been doing all along, and that the "others" just got all that "for free" and could concentrate on the more important things, like learning useful skills, science, etc.
Of course as a result of this encyclopedia I've become interested in, and well versed in psychology and can, as an adult, offer all sorts of advice in all sorts of situations to normal people as I have analyzed both the good, the bad, the worse and the excellent responses to social situations along with a lot of hidden meanings and motivations for certain actions. Just purely "academically" which apparently is the unusual part as I've never had the ability to do it spontaneously on the spot. Every time there was a situation where I felt like someone's response was somehow not in-line with the good intentions I usually have, or I accidentally caused damage with some "blunt" idea or response, I would analyze the whole situation and try to figure out everything, then come up with a more "appropriate" response instead, which I would try next time. Also learning when someone is trying to use you, or is lying to you is something I've learned the hard way. The initial realization that people almost always have ulterior motives when engaging in social communication, and that it's not "raw" idea coming out helped get me started. This was a big breakthrough for me once upon a time... Over time all this adds up.
This is probably mostly applicable to what used to be called Asperger's or "autistic traits, behavior and social blindness in individuals with normal to gifted intelligence". You could say you get two curses: the autism to make you different from others, and the mental tools to worry about it and at least try to adjust. It's probably a bit easier if you don't even get the idea of wanting to adjust, unlike most Aspies who usually do want to at least try some social things one on one or in small groups(max. 5 people). I have always had this dream of living alone far away from civilization by myself due to the absolute hell called the educational system, but can almost completely "mask" the fact in work life. I do still occasionally run into "novel" situations and then it might come as a shock to people around me if I suddenly become "completely lost". "I always thought you were so social and intelligent."
One recent example of a novel situation I've had was that after my health issues started and I had some "woopsies" done by doctors at the hospital, I learned that normally people can't handle talking about death or disability, even when it's not happening to them. Also that it's assumed almost universally that such experiences cause some sort of trauma if happening to an individual. Another thing being that I now know that I have no idea how a normal person "presents" to a doctor, because there is something pretty obviously wrong with me but I am unable to communicate it. The good doctors have at least realized that I truly am just happpily matter-of-fact style listing some stuff that might cause anxiety in a normal person while in great pain and I'm not "just crazy". I just didn't know that you're "allowed" to not be happy or positive when in enough pain to put down any grown man or having sudden loss of mobility due to illness causing almost complete confinement to bed or wheelchair, among other things.
Why can't people just say what they are thinking instead of going through hoops and loops to say or ask something very simple? Why do people judge others, what's the benefit? Why are people interested in what other people do and talk about it without involving that person? Why do people lie about things that aren't even that serious? Why do people need time to build up trust even though there has been no reason for distrust? Why do people seek to become part of a group? Why does he get to tell me what to do in the group? How does everyone else know when it's ok to talk or "break the rules"? Why do people break the rules in the first place? How did my classmates at school know that they are supposed to accept the authority of the teacher? Why had the teachers seemingly explained it to them, but I was asked for blind acceptance of authority without explanation? Why did they later get angry if I pointed out their blatant mistake or cognitive dissonance? Why did my classmates get angry at me when I was just answering truthfully to a teachers question? Isn't speaking the truth a positive trait and the rule? And lastly, how the hell do people know when it's time to scatter from a social gathering without a set end time???
I'm sorry if I offended someone, but this is just me without the masking. I also have ADHD inattentive type as a diagnosis, but the fairly obvious autistic traits were completely ignored at school and when going through evaluations I was most definitely too afraid to let anything show. I was clinically "within normal" but still in every sense all but normal. As a result I didn't get any support and was left to just fight for myself until changed schools and "won the lottery" so to speak as the new class and teacher created an environment where I didn't need any support. I was able to completely normal and any oddities were equal to or less than anyone else. ASD and ADHD are slightly overrepresented(but vastly underdiagnosed at the same time) in the population where I live, which probably made this possible. I then had to switch schools again for middle school, problems again, so switched again and again I "won the lottery". Then starting high school i had complete burnout and a year of sick leave at 16 as I just couldn't anymore. At 17 I took full control of my own life, moved out of home(no real issues there, very caring single mother) and found work, studied this and that on my own terms, traveled the world a bit. Lived in literal poverty in Asia out of my own choice and I was the happiest I had ever been. I learned that the cultural norms define many values and that they can be very different in different places. Asian cultures felt nice because I soon realized that EVERYONE is masking there, normal or not. This made social adjustment quite easy.
tl;dr Autism is both a gift and a curse, disability for some, key to success to others. It's an ability to observe things unobservable to the average person, but comes at huge cost in our socially centered world.