Most people use have Theory of Mind and think of other humans as bundles of emotions and thoughts. They feel them as other minds.

My lack of Social Salience means I can’t sense the social signals and don’t perceive people this same way. I mentally model other humans as black boxes. A black box (in science and engineering) is a system that is understood in terms of its inputs and outputs without understanding its inner state or mechanism.

You may make observations and even draw conclusions about black boxes:

• when X ate cheese they mentioned that they like it
  • fact: X likes cheese (observed: cheddar)
• I have never observed X doing the dishes even when they need to be done
  • fact: X has not been observed doing the dishes
  • fact (maybe): X does not like doing dishes

X stated that they like cheese and I attach a fact to my mental model of X that notes this. I did not infer it, they literally said so. Based on situations (inputs) and actions (outputs) I might guess at some internal state: X might not like doing dishes. I don’t know this for sure, but I have some evidence that suggests it. I don’t know why they might not want to do the dishes (lazy like me?).

That is about all I know about X – what they told me and some indirect observation (and typically I would have to be looking for this).