Well, I didn't find a real, good definition of 'fetishizing' but, if we agree on the one I'll provide below, you should be able to answer for yourself in this and future cases.^1

Fetishization is the choice to extremely, positively overweight one or more intrinsic qualities of a person or group of people, such that there is a sexual or romantic preference of a person or group of people based on that innate trait, irrespective of their overall character as a person.

Autism is weird for this definition because, while it is an inherent facet of a person, it does have a large effect on how a person grows up. This obviously shapes their character.

As an experiment, take your hypothetical dream person. A second party is a necessity for mental grounding. If you can find another person to assist, have them swap out character traits (social, personal, mental, etc.) until you find a point you'd no longer find the hypothetical dream person appealing.

Anyway, hope you can do some self-study and find that answer.

^1 If you don't agree, then we're piss outta luck and I'm gonna leave.

That's just the more common usage. It doesn't just apply to relationships or people, but also hobbies and professions.

Yes?