The current study examined the process by which adolescents choose who to dislike in a sample of Finnish 10th graders. Information was available for the adolescents on their victimization, bullying behavior, problem behavior, school burnout, school grades, and their depressive symptoms. The initial analysis consisted of assessing which characteristics made individuals more likely to dislike someone, after taking into account the characteristics of the individual being nominated. This analysis found that individuals form antipathy for dissimilar others. This process is hypothesized to be a result of mechanisms of threat. The secondary analysis compared the characteristics of unilateral and mutual antipathies. This analysis found that mutual antipathies are characterized by elevated differences between individuals on victimization. These results identify and describe important aspects of the adolescent peer environment. / by Christopher A. Hafen. / Thesis (Ph.D.)--Florida Atlantic University, 2010. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2010. Mode of access: World Wide Web.