I was combating HIV disinformation decades ago, long before DK or Indivisible or the Truth Brigade were thought of. Today it’s ivermectin, a drug that is very effective against parasitic worms, but has no effect on viruses. Hydroxychloroquine, too.
I joined an online discussion group in the days before Twitter et al., a group devoted to the idea that HIV does not cause AIDS, and to various quack remedies. Every day I looked for the latest nonsense, and went to find the truth of the matter. And every day I posted the truth and replied to comments. After just a few weeks, I checked in with the group to find that everybody was gone. I have no idea whether I convinced them or just chased them away.
There are such stories out in MSM and on various social media every day.