Pinky and Rex and the Bully by James Howe 2011, Paperback
Pinky's favourite color is pink, and his best friend, Rex, is a girl. Kevin, the third-grade bully, says that makes Pinky a sissy. Deep down, Pinky thinks Kevin is wrong, but he's still worried. Does Pinky have to give up his favourite things, and worse, does he have to give up his best friend?