The recent research report — the rise and fall of rationality in language — shows a significant shift to emotion in the published public discourse during the 1980s, after 130 years of predominately logic and reason.
After the year 1850, the use of sentiment-laden words in Google Books declined systematically, while the use of words associated with fact-based argumentation rose steadily. This pattern reversed in the 1980s, and this change accelerated around 2007, when across languages, the frequency of fact-related words dropped while emotion-laden language surged, a trend paralleled by a shift from collectivistic to individualistic language.—PNAS 2021-12-21
This trend accelerated again in 2007 according to the researchers. They go on to observe that social media may have played a role in this shift.