"Disorders are not good" is quite a black and white thing to say, considering we have made up the concept of what a disorder is, especially in psychiatry. Disorders are defined by what society believes is harmful and what seems to impair functioning - homosexuality was defined as a disorder in the DSM until recently as it was seen as unnatural. One could argue being gay does have some limitations, like not being able to have biological children, but it is now commonly accepted and is part of normal human variation, and I strongly identity with this take.
I believe there is some grey area with disabilities where there are some difficulties that are inherent, but when it's something like autism where there are also strengths, it's not so easy to say that. Losing a leg doesn't have much positive you could say about it, but autism does. What is a disorder is partly a societally constructed concept.
I respect you can have your own belief and it comes from a great deal of pain. For me, as someone who previously worked in psychiatry as a doctor, and has since then done a lot of unlearning of the overly pathologizing frameworks psychiatry and western society uses, this is the view I have come to. Just because you may feel depressed about your condition and see it as all bad, it does not mean you can speak for everyone with autism. There are people with autism who strongly advocate for greater acceptance and accommodation of autism rather than pathologizing. Those people would be offended at the idea they should "not be propagated", basically bred out.
I know myself that if society was not the way it was, I could have a good life with autism. But there is a lot there to unpack too, like dismantling neoliberal capitalism, the total idealisation of work and productivity as the value of human life, Western constructs of "normal" (for example, indigenous populations often treat autistic or trans people well, accept them fully, do not expect them to do the same as others) etc. Indigenous transgender people may not have gender surgeries, but they have radical acceptance of transgender identities as valid, and everyone will accept the person's gender identity as the truth. Thus they do not experience gender dysphoria like trans people in a western society do, which suggests gender dysphoria comes from stigma and lack of acceptance. Just an example of a "disorder" that with radical acceptance is not really a huge hinderance to a person's life.
Anyway, we don't live in that wonderful world, but it isn't a universal truth that things have to be how they are for autistic people now, and autism does not inherently have to be pathologised.