Propagandists discredit political ideas that rival their own. In China’s state-run media, one common technique is to place the phrase so-called, in English, or 所谓, in Chinese, before the idea to be discredited. In this research note we apply quantitative text analysis methods to over 45,000 Xinhua articles from 2003 to 2022 containing so-called or 所谓 to better understand the ideas the government wishes to discredit for different audiences. We find that perceived challenges to China’s sovereignty consistently draw usage of the term and that a theme of rising importance is political rivalry with the United States. When it comes to differences between internal and external propaganda, we find broad similarities, but differences in how the US is discredited and more emphasis on cooperation for foreign audiences. These findings inform scholarship on comparative authoritarian propaganda and Chinese propaganda specifically.