Yes, socially undesirable qualities like being smaller than other children because they were pushed forward a year for being bright. Or because they wear a discount brand of clothing. Or because they were called a mocking name that rhymed and therefore stuck for years. Or because of jealously. Or because their father had to fire another child's father from their job.
In my experience bullying comes after humiliating public experience. Say something stupid in front of the whole school and made everyone laugh? Good, now you are first candidate for bullying
Yep. I got my share of bruises and ruined clothing for being praised in front of the class for top marks. To this day, I'm very uncomfortable in the spotlight.