Final answer:
The question pertains to a specific social situation, likely concerning issues of inclusion within a school setting, which falls under Social Studies. It is not possible to identify the left-out individual without more context.
Step-by-step explanation:
The question "Who is the kid that was left out of the 217-person group chat?" does not pertain to a factual or academic topic that can be answered with certainty unless specific information is provided about the group chat context. This question seems more related to a social situation, likely occurring in a school environment. It might address a matter of inclusion and social dynamics, which is often an important topic in Social Studies curriculum, particularly when discussing group behavior and communication.
Without additional details, it is not possible to identify the individual left out of the group chat. The question does highlight the importance of considering everyone's feelings and ensuring that all individuals within a social or educational setting are included and respected.