I don't remember past "acceptable" pathologies, or what was considered a pathology back then, it included being gay. It you have a pathology, then you are mad, and if you are mad, then you lose your rights, at best, you are considered like a child, at worst, you end up in a place worse than prison.
Now, if you are diagnosed with an "acceptable" pathology, you actually get some advantages, people are expected to tolerate your quirks and you get full freedom like normal people, you may even get some welfare benefits as you are considered disabled.
To summarize:
Before: You are diagnosed as autistic, you end up in an asylum and lose your freedoms. No one wants that, so you avoid the label, it is just a personality trait.
Now: you are diagnosed as autistic, you get welfare benefits and people find it cute on social media. You want the label.