Most neurotypicals do not think that much about the actual specifics and mechanics of microexpressions, because they both make and interpret them essentially subconsciously, most of the time, unless they are intentionally trying to act, intentionally ‘trying to read somebody’.

Whereas for us autists, it is an active, conscious, logic/analysis process and set of problems/equations/rulesets… that we essentially cannot turn off or not do.

The thing that makes ‘socializing difficult for autists’ is that neurotypicals all have different slightly different rulesets for how this kind of thing works, that they do not realize they have, and they very often have rulesets that are not actually coherent or logically consistent.

They then tell or expect autists to play by these rules that actually don’t make sense, or clash with another NT’s rules, autist gets confused, develops different masks for different people / social groups.

I have literally never had what I would describe as ‘difficulty socializing with’ another autist.

(Well ok I guess barring the situation of an autist who is either significantly developmentally disabled in other ways or is actually catatonic)

We will just actually explicitly discuss the microexpression rules, if it becomes an issue…

NTs generally do not like doing this, they will often get angry or exasperated if you try to broach the topic.