"Controversial comments" refers to statements or opinions that are likely to create disagreement or spark a heated discussion among different people. Full definition
The Conservatives have tried to win over gay voters after a string of controversial comments by party members. (theguardian.com)
For example, it's unclear if posting rules to other Reddit forums like politics or video games, which can be breeding grounds for controversial comments, would result in similar positive results. (fortune.com)
Throughout his career (and after it) he became known for his outspoken and occasionally controversial comments, but it's not an attitude he developed - he came into F1 with it. (wtf1.com)