^That theory is BS, IMHO. I was tall in my childhood. I was almost adult height by the time I was eight. I'm a short ass now....so theory fail, as in, way too many exceptions to the rule.
I also think height discrimination in certain jobs is a necessity, as in you can't be too short or too tall, or it would seriously impede your ability to do your job properly.
I've never had trouble about my height.