My guess is low self esteem. Someone in their life is destorying theirs so they take it out on someone they know they can. I know it is terrible.
But if it helps. I work at a high school and I have seen some awsome teens helping some younger ones . Also teens being so kind to mentally handicapped kids. I guess it is all what they learn and what is modeled for them
Teens like to experiment with different groups and sometimes they think it is cool to tease. Hopefully eventually they see the light and move on to a real group with morals.


