I agree that Khilji was cruel, ruthless and barbaric but here the writer is on about the behaviour and the look of the character.
Historically he was a well dressed and had the basic manners. Here he looks like someone from the jungle. That isn't accurate.
The movie is portraying him as a villain because he was one but just because he is supposed to be a villain doesn't mean he was ill mannered wore some weird clothes and ate as if he was hungry forever.
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