Let’s imagine hypothetically there is some circuit genetically encoded in every human’s brain that gives +10% probability of agreeing with someone if they are a tall male.

Let’s also imagine hypothetically that in many situations, the speed and strength of consensus itself has value beyond the quality of the decision reached, so eg. quickly reaching a strong consensus on the 2nd-best solution would be better than fighting a drawn-out battle to reach a strained consensus on the best solution.

In this (very hypothetical) world, it’s optimal to favour, by some amount, tall males over higher-performing non-tall-males.