Cynthia Leitich Smith
Check out the book trailer for Bully by Laura Vaccaro Seeger (Roaring Brook, 2013). From the promotional copy:
Bully doesn't have a kind word for any of his friends. When the other animals ask him to play, he responds in the way he's been taught:
Chicken! Slow poke! You stink!
Laura Vaccaro Seeger's bold, graphic artwork, along with her spare but powerful words, make for a tender, hilarious, and thoughtful tale.