This is demonstrably not true. Suppose I have a pool of 100 candidates, 20% of whom are female. Suppose further that 10% of the pool (8 men, 2 women) meets my "bar", and are therefore people that I want to have in my company. But finally suppose that I only have budget for 2 people, not 10.

By your logic, I should hire 2 men, because dividing that candidate pool in half leaves the women at "less than half of a person". Equivalently, I should leave it up to a coin flip, which has an expected value of E(two men).

But why? Since we have already established that the candidates are in all other respects equal, why shouldn't I choose the candidates that I think will do my company the most good: bring in the most diverse perspectives, life experiences, and skill sets?

Of course it is a simplified example. And maybe you think that expressing an interest in diversity in this fashion is "reverse sexism". But I think it is a clear win for my company, a clear win for women everywhere, and I don't care if it isn't a clear win for men -- we win often enough anyway.