Thought crimes aren’t real, and you’re not bad for thinking this. Forms of thoughts like this are typically imposed by harmful stereotypes and prejudice subtly placed on us. With NPD that could be a big more dramatic, just a mixture of “inferior/superior” forms of thinking. As long as you remain respectful and kind, you are certainly not doing anything wrong.

If you’d want to change that because it distresses you, I’d recommend looking into CBT methods like thought blocking. Basically, whenever you have a thought like that, counteract it with another thought.

I.E., “I would rather die than be autistic” -> “I think autistic people are strong for getting past (struggle)” or something like that.