Paul was extremely concerned about these things and rightly so. He has said this to arouse them to a sense of shame.
If you have a dispute with another believer and it has got serious, remember that your testimony comes first. Don’t insist on your rights so that you must get justice and that becomes more important to you than anything else. Do you not believe that the Lord will judge every matter? He will see if for the sake of testimony you allow yourself to be wronged. Take it to the pastor or an elder in the church and ask them to help deal with the matter. Submit to the judgment of the church officers. They certainly ought to be just and fair and free from bias. They ought to have a better understanding of the principles of conduct that prevail in the church and who has contravened them.
Does this mean that Christians who break the law of the land should be protected by the church and not brought to justice? No. The disputes in mind here are disputes that are between individuals and are capable of being resolved between them and forgiven if appropriate. They are not contraventions of the law of the land. Every Christian is answerable to the laws of the land in which he is born. He has a higher accountability to the Lord which the state has no business to legislate on, but he is not exempt from obedience to the state as a citizen of that state.