"There are two sides to every coin. The same is true with friends. On the one side of the coin, this sense of belongingness and acceptance draws us to each other. On the other side of the coin, the sense of rejection and oppression mocks, taunts, and condemns."
~author remains anonymous
Everyone has a basic need for social connections, a sense of acceptance, and a sense of belonging. Everyone has a need to determine who they are and how they fit.
There is a natural attraction among peers with similar likes, interests, and/or hobbies. There is a inclination to compare and compete with one another (in appearance, abilities, achievements, acceptance, social standing, etc). When these characteristics "label" a person positively, there is acceptance. When the label is negative, there is rejection. Rejection. Loneliness. Isolation.