I never found them to be duplicitous. Just becasue they might not see something the same way as I do, does not make them wrong.
If an anon online claims to have absolute knowledge of something, iron clad and rock solid, and gives no evidence or source, and blocks people who ask questions, to me that is duplicitous. Also sort of an ego-driven scent, if you will. But I certainly do not wish to get others to see everything the same way I do! What a boring world that would be.