Perhaps they should look at the brains of bullies, too.
I was bullied because I was the only kid in the group from a 'rival colony' and had 'helicopter-ish' parents. Every bullied kid since was either: fat, ugly, new kid in town, disabled or something like that.
I am considering taking up martial arts in an attempt to break this subconscious mindset which I am almost positive was caused by years of bullying as a child.
It's the outcast like other folks are saying. It's just "different" - could be anything: small stature, sensitivity, socioeconomic status, race, religion, expressing that you enjoy learning, your mom sewing your clothes, whatever... If you're the minority of a population you're a target and putting it on "brain differences" makes me scoff.
You're just a rung on a social ladder that other people are willing to step on time and time again to make sure that they're not at the bottom.