I'm kinda confused that this is shocking/ridiculous? I think the latest chapter was pretty clear on the fact that ML wasn't quite right, like legit needed a full-on trip to the psychiatrist. A mental/personality disorder left unchecked since childhood isn't gonna patch him up to have normal thought patterns and behaviors. People like this literally need to actively learn and understand what's acceptable to society because their own compass is naturally skewed.
I feel SO bad for the 2nd girl like, why does it feel like shes being hypnotized? She'd get these dull eyes and spit out thing like she got truth serum... What even