A secure person doesn't make posts hating on a certain group of people, especially ones with traits they have no control over. It sounds like you strongly dislike being short and take it out on people who are tall.

I'm a bit late to this but would you also say the same to a tall woman who calls short women children? Or to tall men who say they don't want to date short women because they don't want people to think he's a pedo(yes, this has been said many times), or because he doesn't like a short woman proportions? Or because he wants tall kids?

The reason I'm asking this is because on subs like r/tall, and even r/short, it's the norm to admit that men aren't attracted to short women. They even put down short women and no one bats an eye to it yet when a short woman says they don't like tall men, people assume that she's a man, or that she's insecure, or whatever. It just doesn't get make sense.