Every person is unique in the person they are and their personal background.
Depending on politics, soci-economics, and ethnicity will determine an individual's viewpoint of a thing, theory, or ideology. People have different perspectives of things because of the influence these factors have on their way of thinking whether you are aware of it or not. For example, if you were to have a discussion about shopping, girls and guys would be separated in how they feel due to their gender. People reflect their backgrounds and personality by their ideas and way of thinking.