Bonzo is constantly angry with ender because he feels inferior to ender. Bonzo is mad because ender is the youngest in salamander army. Also, ender’s thinking is 3 steps ahead of bonzo, and he always has a plan. Ender is mentally superior to bonzo in every way, making bonzo feel inferior, insignificant, and angry. Bonzo also feels under appreciated, outsmarted, outnumbered, and outgunned.
Bonzo’s issues with ender are completely logical for someone in his position.