Yet in like manner these people also, relying on their dreams, defile the flesh, reject authority, and blaspheme the glorious ones.
"...in like manner..." Just like the Israelites, just like the evil angels, just like the people of Sodom, these people are doing these things. If those three examples deserved judgement, don't these false teachers also deserve judgment?
Notice a few things about these false teachers. First, they are relying on their own dreams. Instead of God's word as authority, they are depending on their own fantasies, ideas from their own minds. Second, they are defiling the flesh by doing this. The actions that are coming from the dreams is resulting in a defiling of their own flesh. Third, they are rejecting authority. By relying on dreams instead of God's word, they are rejecting His authority. In the original it could be understood as "all authority". In other words they have become like anarchists. Nobody can tell them what to do. Finally, they have gone so far that they are committing blasphemy.
These people are false teachers, led by their own defiled minds. Is it any wonder that Jude has taken the time to write this letter? The question that you have to ask yourself is this: In what ways am I like these false teachers? Before you start looking around you, always examine yourself first.