Gotta be hyperaware of everything everyone does and carefully mirror them so they don't find out I'm neurodiverse and start expressing sympathy or some shit
Man, if I’m focused on a task and not expecting a social interaction, it short circuits me when someone says 'hey what’s up?’ Worse if it’s shouting and my auditory processing malfunctions
Funny enough, I think I mask incredibly well. A very extroverted and socially aware friend of mine I've known for over a decade commented that in public I masked excellently and seemed to have an excellent grasp of social dynamics and engaged smoothly with neurotypicals, which always confused him as to the inner workings of my mind. He said that in private, I seemed 'almost autistic', but every autistic person he ever knew didn't 'get' complex social situations, while I appeared to understand them and just openly despise them the moment the target left the room. For this reason I had a lot of asymmetric relationships growing up, where people were attached to me but I was often utterly unattached to them.
One of my pet peeves is sometimes people may read somewhere or someone told them about some unique outlier case. They then become too helpful, pretty much to the point it can feel very patronizing.