Women, children, and non-cisgender individuals are obviously going to be shorter on average than cisgender men. (damn, being a cisgender man, that makes me a statistical freak of nature in the worst way possible)
To suggest that people are voting honestly when real-world data suggests otherwise because you're tall is a logical fallacy.
There is no conceivable way that 2/3 of this site's poll voters are at least as tall as 5'9''.