Thin slicing is also based on Schemas. Which is why all of us are racist, and sexist and abelist and transphobic on accident constantly without trying, because we grew in a racist sexist, abelist and transphobic environment and we tend to fall back on those schemas in times of stress.
Sometimes that gut feeling you have is because you’ve spent your whole life being taught to fear or be disgusted by something (schema) and you are thin slicing a situation to determine your own safety, and your schema is saying “be scared of this”
Its not a good or bad thing, its just a human thing.
Schemas keep a lot of people safe from vibes they get from people like pedophiles and rapists and murderers before they even got close to doing something bad.
But its also responsible for a decent amount of white police officers perceiving black people as hyper-strong super human monsters in times of stress and quick thinking.