Girls Rule!

Girls Rule was a comic founded by two girls named Tabitha Cutter and Lisa Russel that Greg Heffley found and read. The comics shows two girls, probably based off of the authors themselves, saying "Girls Rule!" after a boy trips. There was also a Girls Rule comic in the Do-It-Yourself Book. Greg deemed this comic inferior to his own and listed it under a section of the book where he posted comics that would most likely fail against his.

First Comic
In the first comic takes place in a cafeteria. A boy named Tyler Green starts walking near two girls, the two girls keep saying he is not cute and he falls down, then they say "Girls Rule!".

Trivia

 * It is possible (and most likely) that the reason this comic was rejected was either it had too much information on female rights or it was sexist since it mostly concentrates on girls beating a boy.