Adjectives are used to describe a person's character or personality.
Such adjectives can be positive or negative, and it can be encouraging or insulting.
But when a noun is used to describe a person, it can have quite a different meaning.
While adjectives describe the expressions of a person, nouns indicate what the person is.
So to call a person a "fool" or "renegade" is certainly derogatory and insulting.
That is why in the gospel, Jesus addressed the matter of the use of nouns on a person.
It is not just derogatory and insulting to the person, it is also an insult and a criticism level at God who made all human beings in His image.
So let us be careful and be aware of what nouns we are using on a person.
What nouns we use on a person, we may be saying something about God.