Imagine someone who can't feel any real human connection, how would that person value people around him?
Read up on the effects of childhood trauma/abuse on interpersonal connection to understand the etiology of his behavior. He might seem like he's consciously malicious and calculating towards people but I don't believe thats the case, his problems with people are more complex than to be blamed on Bipolar Disorder or him being a shit person. Just hearing him repeat certain things like 'I feel like I have no real friends', 'I was bullied at school'.. etc makes a lot of sense as to why he behaves the way he does.
It's just sad to see him being publicly punished for it. I hope that someone could convince him to go to therapy.