If your 20 friends are all "massive fans" of a given person, I agree, that's a pretty solid indicator of significant bias. Well, maybe not if that person were the Dalai Lama or something like that, but Thiel is not the Dalai Lama. (Even a regular llama would be strong competition.) I should add that the same would very much apply if all your 20 friends felt the opposite way - that would be closer to the norm, but still implausibly unanimous.