Autism is a sensory impairment that radically affects and limits communication. There are certain tests for autism. In one test, a subject will be shown a number of facial expressions alongside a list of emotions (sad, happy, angry, scared, bored and so on). The goal of the task is to pair the emotion with the correct facial expression. Most neurotypical individuals will successfully complete the task. An autistic person won't and that would be one indicator that the person has a spectrum disorder.
Most non verbal expressions of emotion (laughing, shouting, crying, shaking) are culturally non specific. More than that, some are even involuntary if the underlying emotion is particularly strong. This is the case even if modes of dress are culturally specific. If a woman cried and pushed you away whilst shouting in a foreign language, you would have no excuse for raping her unless you could convince a jury that you were unable to interpret her non verbal expressions as a no. If you made that claim then there would be grounds for suspecting a neurological disorder.