Online discourse represents an important part of human communication. When ex- pressing their opinions in an online environment, people are empowered to be more direct, often without considering other people’s face. In certain situations, they may even be offensive or impolite. The focus of this study is the manifestation of impoliteness in reader comments on Serbian news sites. The study adopts Bousfield’s (2008) extended framework of Culpeper’s model of impoliteness strategies (1996, 2005) in order to examine and classify different manifestations of impoliteness. It relies on the analysis of a small specialized corpus which consists of the data collected from reader comments on Serbian online news articles related to Novak Đoković being denied entry into Australia in January 2022 due to the men’s number one tennis player not being vaccinated, which was one of the most vigorously debated topics in both mass media and social media in Serbia amid the coronavirus pandemic. The data were analyzed qualitatively. This study reflects how Serbian language users engage in impolite communicative behavior by identifying the most common impoliteness strategies, as well as their functions, and indicating distinctive features of Serbian impolite online discourse.