Kay used to do this about the evils of vaccinations AND the wonders of pot. We would answer texts and videos with things like "Thank you" and "We read it." Wouldn't engage her.
Sometimes she would follow up with an angry call saying stuff like it was sad that we couldn't see her RIGHT point of view and that we must think she isn't smart if we don't agree with her "research." We were horrible parents for not supporting her, blah blah blah.
If she called me, and she did more than she called Dad, I would usually end the call saying "Somebody is at the door. Later."
My default is to not engage. But it was hard to listen to her stuff. She also had a need for us to agree that she was right. But we are bad liars.