Ben's problem in finding a heterosexual girlfriend isn't that she's short, it's that she's a woman.

It is well possible that some women's aversion to short men is because some part of their brain perceives short men as potentially female (a trait that comes in handy now that a significant amount of suspiciously short, bearded people actually ARE women, and might well become more common as evolution marches on ... assuming that a significant amount of women remain unvoluntarily childless by being duped by transmen, which I hope won't happen, but you never know), but there's always been enough women who don't have a problem with short men.

Heterosexual women who are into short men won't be into an average sized woman, though, because they're hetero.