It's weird how quickly people will deny facts when it's to support something they really want to be true. I've met people (very few mind you) who seem completely sensible and intelligent but immediately lose all credibility with me once we start talking about vaccines, weight loss, how old the earth is, if the sun rotates around earth or the other way around, and one of my personal favorites, if the earth is flat or not.  People will really believe straight lies if it fits the narrative they want.