Sometimes people need more evidence to see the truth. Most of the time people do not have the emotional or educational scaffolding to even understand the evidence. If those people were capable of empathy they would not need to rely on an authority figure to tell them what to think.

Gaslighting. The internets favorite buzzworx that exactly describes this behavior.

You cannot win an argument with liars or the ignorant.

This. Everyone needs to be mindful about what they post. You are communicating with real human beings afterall, with their own life history and memory.

So be kind and give up the fantasy you can reverse your actions.