If the Word says it then it is so. Below are some excerpts from some commentaries:
1Co 6:3 Know ye not that we shall judge angels,.... Meaning not the ministers of the Gospel, and pastors of churches, called "angels", Rev_1:20 whose doctrines are examined, tried, and judged by the saints, according to the word of God; nor the good angels, who, were it possible that they could, or should publish a Gospel contrary to what has been preached by the apostle, would be contradicted, condemned, and accursed by him, see Gal_1:8 but the evil angels, the devil and his angels: and this is to be understood not of their future final judgment and condemnation at the last day, when saints will subscribe unto, and approve of the sentence pronounced upon them, and will triumph over them in their destruction; but of the judgment of them, and of their ejection out of the Gentile world, out of their oracles, idols, and idol temples, to which Christ refers, Joh_12:31 and calls the judgment of this world, and the casting out of the prince of it by the ministry of his apostles; and which was now already begun, and ere long would be fully accomplished: accordingly the Syriac version renders it, "know ye not דלמלאכא דינינן, that we are about to judge angels?" and the Arabic, "know ye not that we judge angels?" from whence the apostle infers very justly,
From John Gill's Exposition of theBible
1Co 6:3
Shall judge angels - All the angels that shall be judged, good or bad. Probably the reference is to fallen angels, as there is no account that holy angels will then undergo a trial. The sense is, “Christians will be qualified to see the justice of even the sentence which is pronounced on fallen angels. They will be able so to embrace and comprehend the nature of law, and the interests of justice, as to see the propriety of their condemnation. And if they can so far enter into these important and eternal relations, assuredly they ought to be regarded as qualified to discern the nature of justice ‘among men,’ and to settle the unimportant differences which may arise in the church.”
From Albert Barnes notes on the Bible
1Co 6:3
Know ye not that we shall judge angels? - Dr. Lightfoot observes that “the apostle does not say here, as he said before, the saints shall judge the angels, but We shall judge them. By angels, all confess that demons are intended; but certainly all saints, according to the latitude with which that word is understood, i.e. all who profess Christianity, shall not judge angels. Nor is this judging of angels to be understood of the last day; but the apostle speaks of the ministers of the Gospel, himself and others, who, by the preaching of the Gospel, through the power of Christ, should spoil the devils of their oracles and their idols, should deprive them of their worship, should drive them out of their seats, and strip them of their dominion. Thus would God subdue the whole world under the Christian power, so that Christian magistrates should judge men, and Christian ministers judge devils.”
From Adam Clarkes Commentaries on the Bible
