I think it’s rather interesting that even though he said he doesn’t care about you 6-7 times, told you to shut the f up and called you horrible names, you stayed on the phone. Honestly rather than focusing on why he was so nasty (no way to find an answer) maybe it’s time to focus on why would you stay on the phone with the person you don’t even know while they cuss you out, call you bad names and show total disregard for you. I think finding answers to why you have no self respect and allow such blatant disrespect rather than focusing on him.