Most people are familiar mainly with lower-functioning forms of autism, so the fact that you seem to be getting on fairly well might embarrass him. My dad was "angry-shocked" when I told him I was HFA but he read about it a couple evenings, thought it made perfect sense, and that is how that works. However, I don't know if your uncle is like dad; he might not be the type to actually use reason as he obviously doesn't use etiquette & boundaries either.
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Your neurodiverse (Aspie) score: 134 of 200
Your neurotypical (non-autistic) score: 72 of 200
You are very likely neurodiverse (Aspie)