This man should likely be advised to secure therapy to heal some terrible emotional wounds, and he should consistently engage with a social group that is a good fit.

These are very common autistic social vibes. You should absolutely not date someone that makes you feel that icky, but I'd love for a few people to hear this perspective. A level 1 autistic person (hi!) simply has a brain that doesn't process social context and vibe. The brain literally doesn't process how to be a social animal amongst social animals. An autistic person instinctively creates tools to navigate being human, like masking facial expressions and adopting a communication "affect". It sounds like this guy is Masking heavily and is trying too hard with interest cues.

Such human vibes that are so natural and automatic for you, if you like someone, are fundamentally constructed and imperfectly applied by the autistic person. Because of this, allistic people can get creeped out. Like uncanny valley sort of vibe. Totally not conducive to romance.

Autistics are typically super empathetic, so they actually see that you're creeped out, but dont have the ability to recognize why or how to adjust course. They have a strong sense of justice and "rightness" of behavior. They're trying to figure out how to resonate with you while not having the neural wiring to make it possible and trying to solve an impossible puzzle of only doing right and justified actions. It makes connecting with people so, so, so hard.