I don't think it's only adolescents. You can see rich Google employees bullying poorer developers on Twitter in the name of social justice. Some of the bullies must be at least 50 years old.
Social media and Twitter are bad because you can form virtual tribes and yield to age-old instincts.
The more individualistic people are, the less they join those tribes. Individualists tend to be grumpy though, for which they are bullied by the perfect Twitter moralists.