They shouldn’t quit dealing with the USDA automatically, for to do so in itself is a type of capitulation.
They should sue the USDA. It is already established law that a government agency cannot discriminate on the basis of religion. The ACLJ would be happy to take the case up. (Note for those who do not know, the ACLJ (American Center for Law and Justice) is not to be confused with the ACLU.)
It’s bad policy to back down from a bully, especially when you have a good case.
Is Obama FDR’s revenge on Jews?