He means demonise has the implication of being mischaracterisation rather than descriptive. If they are already a demon, you can't demonise them (turn them into a demon). Colloquially, he's just being pedantic.
I mean, he probably didn't really know the definition of the word since it's been used as a "bad thing" for so long. But we are in fact portraying them as wicket and threatening because that's what they are.
He means demonise has the implication of being mischaracterisation rather than descriptive. If they are already a demon, you can't demonise them (turn them into a demon). Colloquially, he's just being pedantic.
I mean, he probably didn't really know the definition of the word since it's been used as a "bad thing" for so long. But we are in fact portraying them as wicket and threatening because that's what they are.