Incivility in public online discussions has been seen as a major challenge to democratic discourse. There are concerns that this mode of communication fosters dissent rather than promoting consensus. Although it is empirically well-documented that online incivility can have various negative effects on recipients and discussion dynamics, there is an ongoing scientific debate regarding the conceptualization and study of incivility from a perceptual perspective. In an effort to address this issue, an interdisciplinary approach combining communication science and social psychology was employed to examine incivility. The communication science project focused on developing and validating a comprehensive typology of incivility, while the partner project investigated the psychological mechanisms underlying the emergence of different incivility types and their effect on recipients. By offering an interdisciplinary and innovative perspective on this phenomenon, the tandem project made significant contributions to the understanding and explanation of incivility, yielding important implications for both science and practice. The paper discusses the detailed results and implications derived from this research project.