The dignitaries against whom the false teachers cavil are probably angels, though they could be church leaders. But, in contrast, angels who are much greater and more powerful than men do not behave so disrespectfully even when justly confronting an enemy of the Lord. Again, the false teachers are likened to animals in their behavior, for they act in ignorance of the realities of death and judgment and, like animals, react only to the present circumstance, heedless of the consequences. They pour abuse on things which they do not understand, like an angered dog attacks someone whom he thinks is threatening him. The phrase perish in their own corruption can actually mean corrupted by their own corrupt living.
Sensuality is self-destructive.
The feasts mentioned were the Agapae, or love-feasts, built around the celebration of the Lord's Supper. But in fact they were spots and blemishes, disfiguring and degrading the purity of the Lord's feast. Another form of their deceptive practices. Further, they cannot cease from sin for such lustful fantasizing had become habitual with them. As a consequence they easily convinced certain unstable souls in the church that this was acceptable Christian behavior and lured them into sexual immorality.