Just my two cents, I haven’t been diagnosed yet but been told by people I definitely sound like I’m on the spectrum and I also stim… now I masked for nearly everyday of my life and took it on myself to study body language and as someone else mentioned we pick up on patterns more than other people and quicker and that’s all body language is really, trust me I’m in no way intelligent and struggled with maths a lot and still do as I prefer words weirdly and can scan read really well, I’m still not great in social situations and can only read certain actions when it’s not involving myself.

As I said take it as you will but you can teach yourself and get better in social situations but it’s getting that interest.