Answer:Prejudice
Explanation:
Prejudice is strong negative attitude or stereotype that one has about a particular group of people that is usually unreasonable or baseless but only driven by the fact that those people don't belong in the same group as this person. This is a prejudgement that makes a person group everyone together as the same in that particular group without even giving them a chance to prove themselves.
It could be because they are from a diffrent race, socio-economic status, different class, different backgrounds etc.