“Have you been in the company of a group of which you were clearly not a member? What was the circumstance? How did you act? How were you treated?”

I have witnessed someone being left out during a group discussion during a term 2 sabbatical in secondary 1. The sabbatical required students to solve non-routine math questions. The person was not very strong in math but ironically, he still joined this math sabbatical. He probably did not choose this sabbatical as a first choice. Although the person was “included” into the group discussion, his ideas were not taken seriously as the other members felt that he was of no help.
This practice of leaving others out of group discussions is not very healthy. Although the person who is left out can still listen to the discussion, he would usually not learn from the lesson, as he, being already weak in the subject, would not understand the content of the discussion of the other members.

In this case, the person who was left out is not very sociable during normal times, which leads to the other members of the group excluding him from the discussion.

We normally exclude people who we find are do not like or who we are not comfortable working with from our group or team. Even if a person is talented in the topic of discussion, people might exclude him from their group for a few reasons. Some examples are that the person is has a bad record and that the person is usually anti-social. Regarding the former, we usually exclude someone because we do not trust him. The bad past record has already tarnished his reputation and just because the one thing that he had done, we feel that he would remain in his own self and that he would commit the same mistakes that he did in the past. Therefore, we exclude him from the group.