After she (ex) found him cheating on her with multiple women, she confronted him and her confrontation met with severe mental abuse along with character assassination. When she finally left him, he spiraled into extreme psychosis, got into hard dr*gs and spent most of his time on the trad internet circle. This event marked a monstrous shift in his behaviour and this is why he started insulting people using abusive language. I’m not sure why, but maybe he saw his dad being abusive towards his mom throughout his childhood.