The dialogue has you say you won't believe anything he shows you, so he shows you something that makes him look evil. Then you believe that without doubt is a little on the nose for confirmation bias
It is lore accurate mind flayers do in fact feel emotions, but more they are considered alien and negative.
I appreciate having the choice to flip out on being chaotic evil, that has the same energy as romancing karlach, have her transform and then going "die monster!" at the ending
