As it turns out, Jia Susu was not crazy, nor was she imagining things. Dante really was different from how he usually was, at least within the True Martial World.
Dante was a typical ignorant Westerner, and his view of Ancient China was exactly as depicted in the various web novels and web comics from the same place, not the actual history from the history books.
So he functioned with the idea that everyone here was missing all their screws, and people killed for the stupidest reasons. A young woman could kill because you saw her naked, a man could kill because the girl he liked spoke to you, an old man could kill because you disrespected him by not groveling in his presence, and an old woman could kill you because somehow her disciple or daughter fell in love with you.
So he usually strutted around acting as arrogant and indifferent as those main characters from those stories. When in Rome, do what Romans do, right?