Final answer:
Julie interpreting a friendly argument as a violent fight because it involves outgroup members is an example of prejudice.
Step-by-step explanation:
When Julie sees outgroup members having a friendly argument and interprets it as a violent fight, it is an example of prejudice. Prejudice involves having a negative attitude and feeling toward an individual based solely on one's membership in a particular social group, often without actual experience or interaction with the outgroup. In Julie's case, she may be attributing negative qualities to the outgroup members, leading to a misinterpretation of a non-violent situation as violent, which demonstrates her prejudiced perspective that might come from stereotypes she holds about that group.