We can know from one episode of Baby in the Sea: After Boss Pi failed to steal the recipe of delicious crab roe bag again, the crab sat on the stool and told Spongebob about his childhood with Boss Pi. It turned out that Boss Crab and Boss Pi were good friends when they were young, because his family was poor, and all his clothes were picked up. When he went to school, all his classmates laughed at him, only Boss Pi accompanied him wholeheartedly and helped him tell those who laughed at him. When eating, I couldn't afford a hamburger, and the owner of the hamburger looked down on them, calling them "ragged children". Boss Pi and Boss Crab were very angry. They both made up their minds to make their own hamburgers. After numerous failures, they still didn't succeed. One day, they began to quarrel, and they didn't know what formula to pour in, so delicious crab roe buns were born, but Boss Crab alone occupied the recipe of delicious crab roe buns.
From this episode, we can know that Boss Crab and Boss Pi were good friends when they were children. When they were in trouble, they warmed each other and helped each other, and both gave each other their last best.
Although they broke up when they grew up, in normal times, Boss Crab laughed at Boss Pi, and Boss Pi also made fun of Boss Crab. They loved each other and killed each other. No matter what time, the friendship between them still existed.