You have a very acerbic approach to the notion that other people have developmental disorders apparently borne out of a persecutory delusion that they have developmental disorders solely to declare the way your brain works boring, and brandish your ignorance about them with unusual glee. If someone tells you they're dyslexic, do you lash out at them because you think they're trying to throw shade on your boring normal ability to read?
Autism is not a catch-all for people who are weird. Psychiatrists diagnose autism using a set of defined criteria where autistic people differ from the average population, where those differences are not explained by other disabilities that often result in similar differences (https://www.cdc.gov/ncbddd/autism/hcp-dsm.html).
It's true that we don't have a full understanding of autism, or explanations of why individuals vary in the specific symptoms they exhibit, but that doesn't mean the diagnosis is a random label applied to anyone who is weird, it means that psychiatric conditions are often difficult to understand, and that we need more scientific research to understand them better. People with schizophrenia would also be considered "weird" by most of the population, but we don't label them autistic because of that. I, and I think many others, consider Snoop Dogg a bit weird, but I wouldn't attribute that to autism; I would attribute it to his Snoop Doggness.
Gadsby isn't saying that autistic people have a monopoly on suffering, but that autistic suffering comes from a specific set of limitations, and not understanding what those limitations are, or thinking that you could just rid yourself of them through sheer force of will is very frustrating. Paraplegic people also suffer, but it's not because they have limited social cognition or hypersensitivity to sensory input, it's because they lack the use of their legs in a world largely designed for those that can walk. Paraplegia is, however, much more visible and more easily diagnosed that a developmental disorder: we can easily see that paraplegics cannot move their legs, and paraplegics can easily see what people who can walk are able to do that they can't.
Developmental disorders are much harder to see: you cannot peer inside an autistic person's brain function and see how their brain functions, and autistic people cannot see inside the workings of allistic brains to see that they're using mental "limbs" that they cannot exercise. It'd be cool if we could! but science has a ways to go before we can.
The complaint about neurotypical parents and medical professionals isn't that they're oppressing or subjugating autistic people, but that they're describing the condition from the perspective of someone who lives without it and can't easily conceptualize that experience--the diagnostic criteria can identify who has autism, but they can't describe how it's shaped their lives. For lack of a more elegant description, if you're disabled, hearing someone who shares that disability "i know that feel bro" with you helps immensely to alleviate feelings of isolation, much more than a doctor explaining the diagnostic criteria you meet.
Your strong objection to people talking about negative experiences and view that emotional repression is a virtue are yours to hold if you so desire, but I hope you understand that many people don't feel the same, and will consider you a callous, oppressive person if you try to enforce that opinion as the correct one by treating their sharing their problems as a personal attack. This isn't a criticism of your boringness for lack of a developmental disability, it's a criticism of your wanton disregard for others' experiences and unjustified, self-centered offense that they have the gall to talk about them.