Psychopath implies lack of empathy so I don't think that's quite the word you want. You could maybe repurpose "psychotic" though!
“ As it turned out, there is nothing special about psychopaths when it comes to understanding or feeling empathy with others. ”
https://www.psychologytoday.com/us/blog/fulfillment-at-any-a...
But maybe it is like so often more about the contradictory definitions of “empathy”, and capability vs. willingness.
Maybe lack of M&Mpathy?