All I’m saying is that near-unanimous agreement about P in the relevant scientific field is pretty strong probabilistic evidence for P, and reasonable people are more likely to take probabilistic evidence into account than unreasonable people, so if all you know is someone disagrees with P and hasn’t heard the best arguments, such near-unanimous agreement constitutes probabilistic evidence against that person being reasonable.
All I’m saying is that near-unanimous agreement about P in the relevant scientific field is pretty strong probabilistic evidence for P, and reasonable people are more likely to take probabilistic evidence into account than unreasonable people, so if all you know is someone disagrees with P and hasn’t heard the best arguments, such near-unanimous agreement constitutes probabilistic evidence against that person being reasonable.