Stereotyping

A stereotype is a popular belief about specific types of individuals or certain way of doing things. The concept of stereotype and prejudice are often confused with many other different meanings. Stereotypes are standardised and simplified conceptions on people based on prior assumptions. Another name for stereotype is bias. A bias  is a tendency, most of these are good, but sometimes stereotyping can turn into discrimination if we misinterpret a bias and act upon it in a 
negative manner. It a way to marginalise certain individuals; telling things like they are not acceptable and all.

Here are some cases where people are being stereotyped:

This picture shows that however you are, you are going to be stereotyped.