Because in our past, genes that make men taller and women shorter apparently increased the odds of your offspring surviving to adulthood.
This doesn’t mean those specific evolutionary pressures are still in effect.
If they aren’t, you’d expect men and women’s heights to even out over time, but we’re talking tens of thousands of years here, at least. Evolution can work faster, if there is a lot of pressure, but I don’t think that’s the case for height.
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