Regular reminder that being an asshole is not a symptom of any form of neurodivergence. (You can replace “neurodivergent” with depressed, anxious, bipolar, etc. and the diagram works equally well)
ETA: social faux pas, awkwardness, and genuine symptoms of neurodivergence don’t make you an asshole. I shouldn’t have to say this? An “asshole” is someone who enacts a pattern of abusive, controlling, harassing, and/or harmful behavior with no remorse or concern for how other people are affected.
Sounds like you touched on their special interest. You almost certainly made their day, even if you felt a little awkward. I have autism and my special interest has changed several times, but that passion usually remains (especially if it lasted for a year or longer). It’s taken my entire adult life to figure out when people no longer care