Someone who calls another person a 'lilbitch' could mean one of the following:(or in some cases several of them)

A. Someone who is better than them and they are pissed off about that.
B. The person who calls the other person a 'lilbitch' is uncool and has no friends.
C. The person who says 'lilbitch' has no sex life.

ninintellectual non-quating members who try to make fun of cool kids in school for being social and not social rejects such as themselves