That isn't really a fair assessment; it is true that large groups of people generate more wild theories but there was a lot of misinformation everywhere. Most of it inconsequential.
But weighting by consequence it is hard to overlook things like:
- "Plague of the unvaccinated" and the tide of misinformation saying that the vaccine would halt COVID. A lot of people believed that. They were wrong. And a lot of the blatant human rights violations through the COVID era were probably driven by that particular mistake. It wasn't a right-wing phenomenon.
- "14 Days to Flatten the Curve", which turned out to be critical misinformation that derailed any debate over the wisdom of lockdowns. Certainly a forgivable move given the urgency and confusion in the first few months, but the fact that it was material and misinformation stands out in hindsight.
- Dismissing a lot of legitimate studies related to Ivermectin. It turned out that they were showing that people who had parasites + COVID had a much better response to COVID if they took an anti-parasite drug so, y'know, fair enough but not that useful in the west. But there was a lot of misinformation that the studies themselves were fake that undermined trust that the responders were looking at evidence. That dismissal was also certainly not coming from the right wing.