Why sue you when they can just post on the internet, pointing out that you are clearly wrong?
Twenty years ago, Chinese motion sickness researchers said that the articles I published online were slandering scientists, which had seriously damaged their reputation. They wanted to sue me for libel. However, they are only limited to warning me on the Internet, and so far they dare not really sue me to the court.
Motion sickness researchers still dare not sue me because motion sickness researchers, like pseudo scientific gastrologists, are afraid to attract media attention.