Characters
Horses are fascinating animals. Dumb as fenceposts, but very intuitive. In that way they're not too different from high school girls: they may not have a brain in their head but they do know all the boys want to fuck 'em.
— Ramsey

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Ramsey delivers a crude, cynical comparison between horses and teenage girls. It starts as a mock nature note about horses being dim but intuitive. The joke is the rude punchline, and it reflects the speaker's offensive view rather than any fact.
Context reviewed