I make snap judgements on statements, supposing age, race and sex, yes. (not the other way around as you suggest.) I then investigated to see if my supposition

I make snap judgements on statements, supposing age, race and sex, yes. (not the other way around as you suggest.) I then investigated to see if my suppositions were correct. That they are helps me make judgements with insufficient data in the future. If they are not it helps me broaden my model.