Why do tall guys care so much about height?

Most tall guys I hear from want a woman at least a whole foot or more shorter than them. I've even heard tall guys that say that taller women 5'7+ are still too tall for them even though they are shorter them. I don't really understand why people want such a big height difference. Its not just women that want 6'0+ guys, its 6'0+ guys that don't even want tall women.
Why do tall guys care so much about height?
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