Explores the social ecology of classroom aggression, demystifying four common "response dispositions" (exquisite sensitivity, group offense patrol, slight trigger disease, and heavy into violence) that provide fertile ground for uncivil behavior. To create a climate of classroom civility, teachers should engage in self-analysis, imagine a civil climate, build a repertoire of initiatives and responses, and make a long-term commitment to civility. (28 references) (MLH)