Answer:
You are noticing people who confirm your stereotype and overlooking those who don't have.
Explanation:
Stereotype: It is a sociology phenomenon in which a person has an exaggerated and distorted perception of a specific group of people who determine specific qualities. It is the building block for prejudice and discrimination. It is a fundamental sociology phenomenon that is based on individual perception and personal attributes of a special group of people. It occurs in males and females when females use feminism and support the misconception about gender inequality. Thus here in the question, the bartender is using a stereotype thought about a specific group of people who have a tattoo on their arm.