A lot of that is just Berkson/conditioning on a collider. Few situations select randomly from the population. If someone is visibly extremely X, in a situation where you are there because of X+Y, then the implication is that they are extremely not Y. If you see an extraordinarily beautiful man or woman accepting an Oscar, you will suspect that they probably aren't extraordinary actors; if you see Andre the Giant guarding the bar door, you will suspect he is probably not an elite MMA martial artist.
Fun post. I’ve pondered for awhile two weird social biases:
(1) really beautiful women are assumed to be dumber than they are.
(2) really large, physically impressive men are assumed to be dumber than they are.
Many possible reasons
A lot of that is just Berkson/conditioning on a collider. Few situations select randomly from the population. If someone is visibly extremely X, in a situation where you are there because of X+Y, then the implication is that they are extremely not Y. If you see an extraordinarily beautiful man or woman accepting an Oscar, you will suspect that they probably aren't extraordinary actors; if you see Andre the Giant guarding the bar door, you will suspect he is probably not an elite MMA martial artist.