When I see some of the "tough talk" a few here give people in the depths of despair or confusion about things, I have to wonder if they're really autistic, because they don't seem to understand the condition at all. (There's probably no autisic person that has not heard all the tough talk thousands of time before. It's all the NT world knows, and they just assume if you drum that stuff into our heads enough times, it will finally "click", and that's the whole problem of "ableism"; not understanding there's a legitimate neurological problem, and so trying to funnel the person through allistic "NT" protocols, and then getting frustrated with them; thinking they're just being obtuse, and trying to rub in all the more the tough talk, like that they're just "doing it to themselves", etc. This is just going right back to life before autism was even known about, the proverbial "forcing the square peg though the round hole"; and precisely the cause of much of the suffering of autism).
So the message often actually ends up boiling down to this self-promoting "When I was like you, I learned to fix myself and welcome criticism...", etc. and all of these apparently memorized formulaic responses such as "thinking everyone's attacking you", (even if you didn't say that) where they just dismiss everything you say like nothing. (They at this point ignore the fact that the NT world has defense mechanisms too, and do try to attack, trick or at least put unfair burdens on anyone seen as vulnerable —which will naturally include those with autism. If the autist calls this out, he's accused of "distorted thinking" and making it "all about him"; but it's not; it's what people do to everyone. Are people kidding to deny that this goes on in the world? I see one person saying something like "The autist needs to realize the world's not that bad". That is at best subject to each individual's experience. Tell someone in Ukraine that now!)
What does all of this this look like in the person giving such "counsel"? They got it all together, while you're just stubbornly wallowing in your problem. So they in comparison seem to "shine". Not only to others, but also to themselves. (Makes them feel better about themselves). They might have had some autism-like problems or even been misdiagnosed (and this whole thing is a spectrum anyway), and they were able to fix themselves. Great! Others are not that fortunate, and the problem is not allowing that they might not have your ability, especially when terms like "excuses" start getting tossed around. (which denies any difference of ability; hence, "ableism").
So there's a motive for you, for one potential answer to the topic question. The comparison of they fixed themselves, while these other people just "choose" to remain in their state. They're now joined with the rest of the "world", and autist needs to come up to "par" with "the rest of us". (Natural need to "belong" with the "majority").