Final answer:
The ability to discern if someone is upset involves understanding emotional expressions and nonverbal cues. Situational context, personal values, and experiences play a key role in how emotions are displayed and perceived in events like the Boston Marathon bombing. Making assumptions about a person's class or education based on appearance can be misleading and fails to acknowledge the complexity of individual circumstances.
Step-by-step explanation:
Perhaps you're inquiring about how to discern if someone is experiencing emotional distress or upset. Recognizing a person's sudden change in emotions requires a level of awareness and understanding of nonverbal cues. For example, the joke about how quickly you might know if someone is vegan addresses the stereotype that certain topics or identities can quickly surface in conversation, but this is less about emotional states and more about social cues and perceptions.
In situations like the tragic event of the Boston Marathon bombing, emotions such as surprise, fear, anger, and sadness are powerful and can be seen through immediate reactions. While the physical expressions of these emotions might be universal, the reasons for why some individuals respond by helping and others by fleeing can be complex, often influenced by various factors such as personal values, past experiences, and situational context.
As for appearances indicating class or determining education based on clothing, these are commonly-held beliefs or stereotypes that people may use to make snap judgments about others. However, such assessments can be inaccurate and do not account for the nuances of individual circumstances or the role of personal choices in fashion and finances. It is crucial to be cautious when making assumptions about others based on outward appearances alone.