I've ran across many insecure people, and severe cases are mostly men who are like ~5'2" "tall" and have to be alert when the house cat is hungry. Understandably since their heigtened aggression serves the purpose of surviving.
As a manlet myself I can attest that taller men like to poke fun at shorter ones which is, when light heartedly used, pretty amusing. Interestingly, the most spiteful humor seems to come from the 6' even crowd.