Question about south park episode T.M.I?

i was watching it and this weird part came up. cartman has to go to anger management, and the psychiatrist tried to get him to get mad. he kept calling him fat, fatty, tubs, etc. while this is going on, cartman is typing something into his phone. then counselor says he's calm. then the counselor's phone rings and its his wife. you can't hear what she says, but the counselor says, "calm down, what do you mean? "webchat with wha?" "what 14 year old girl?" "i don't have criminal record" "who is mitch connor?" "theres no official police report." "PUT THE GUN DOWN, CAROLE?!?!" BANG. then cartman looks at him creep and says, ''im not fat, im big boned. WHAT DID HE DO?!?!