What method did protests use to fight against “whites-only” lunch counters in the South?

One of the main methods used by protesters to fight against "whites-only" lunch counters in the South was nonviolent direct action. This included sit-ins, where protesters would sit at the lunch counters and refuse to leave until they were served, despite being denied service because of their race. This strategy was used to draw attention to the injustice of segregation and put pressure on businesses and governments to desegregate. Protesters also engaged in boycotts of businesses that maintained segregation policies, as well as legal challenges to these discriminatory practices.