It is called stereotyping. Depending on the situation, the group and the nature of the assumptions, other applicable terms might be prejudice, profiling, being one of the "in's", or in the In-Crowd, the elite, upper- middle- or lower-class.
A group of similar individuals living together in an area is called population.
A large number of people together is called a crowd or a group.
When a group of people get together to make a quilt together, this is called a quilting bee. When a group of people get together to share, sell and buy quilts and information about quilting, it is called a quilt show.
Quartet.
teamwork/ partnership
A gang of people
A group of six people is a sextet. A group of six babies born together is sextuplets.
Stereotyping is a way of placing general characteristics on a certain group of people. Assumptions are made about how a group is supposed to look and behave. Stereotyping is often unhealthy because it keeps us from getting to know individual people, if we make assumptions about the group they belong to.
the group of people forming a community that interacts together is called society.
it is a group of bad people[;
A Commune
Stereotyping is a way of placing general characteristics on a certain group of people. Assumptions are made about how a group is supposed to look and behave. Stereotyping is often unhealthy because it keeps us from getting to know individual people, if we make assumptions about the group they belong to.