I'm not saying I endorse MDMA for anxiety in autistic adults, I'm saying I like their approach. Two different things.

Fair enough but what I'm saying is that I prefer evidence-based approaches to treating the actual problem.

These behaviors that define a person are in the diagnostic label. "Obsessive interests", "repetitive movements", etc. are part of the autism diagnosis. Of course a lot of these symptoms are maladaptive, we live in a NT society.

All of the symptoms are maladaptive and it's not because of the society we live in. Keep in mind that the criteria isn't just "obsessive interests". Those criteria are only viewed in relation to their level of severity and the impact it has on the life of the individual.

So when a diagnostician reads the criteria, they read it more like: "Obsessive interests that interfere with the person's ability to do the things they want to do, maintain relationships with people they love, hold down jobs in order to support and feed themselves, etc".

The point being that there's nothing wrong with choosing to engage in obsessive interests. That's why all the other people with similarly obsessive interests aren't diagnosed with any disorder. The difference is just whether the person has the choice to engage in those interests or not. If the person feels like they have to engage in it otherwise they get distressed, upset, or whatever then that's a bad thing we need to help them with.

I was perfectly fine before I met society.

You were able to live a fully autonomous life and deal with the stresses in life (e.g. having your stimming interrupted by an outside, uncontrollable force without being distressed in any way)? If so, I'm not sure why you'd be diagnosed at all.

One thing I don't understand is why there is resistance to teaching autistic people how to deal with society but there isn't the same pushback when we teach NT children how to deal with society? Those kids were fine before meeting society but I think there is a reasonable assumption that giving people the tools to make choices that are consistent with what they desire is better than forcing them to be trapped by their inability to enact autonomous decisions.

I still have the same brain, same autistic symptoms from when I was born.

Whether you have the same brain is irrelevant to whether you have autism or not, but if you have the same symptoms then that sucks, treatment isn't always perfect but hopefully you're better able to deal with the world.

If you just mean that you retain many of the traits associated with autism whilst now being able to cope with the world, then that's awesome.