Ostracism: n. excluding from a group which may just be no communication with a group
Ostracism is frequently a group excluding one or more humans from participating in the group. If you exclude a human from your life and want nothing to do with them or avoid them as much as possible then you are really making a personal decision to ostracize a human from your life.
Being a member of a group is important as a teenager and whether you fit in means that you believe what the group does and participate in things approved by the group. This cliquishness is an example of herd instinct and is one of the major reasons for prejudice and discrimination in this world against other ethnic, religious, and cultural groups and the humans coming from them.
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