Why do Cantonese people call themselves Hakkas?

The main ancestors often migrated repeatedly. The reason why Cantonese people are called "Hakka" is mainly related to their repeated migration. They drift everywhere without a fixed place. No matter where they wander, they are "guests" to the local people. Even though they are guests, the surrounding local people have their own unique customs and habits. However, when these new "guests" migrate over, the two dialects, customs and other cultures will conflict, which will arouse the resentment of the local people and cause future problems. Contradiction and conflict.