A good man doesn't fight with a rooster.
(Note: This is a direct translation. The phrase might not make sense in English as it does in Chinese, since it's a culturally specific expression.)
If you want to convey the meaning more clearly in English, you could say: "A good man doesn't engage in pointless arguments."
A good man doesn't fight with chickens --- if you fight with a chicken, you can't win, so just run away. Look at you, you're actually quite handsome when you run away.