You called Trevor a motherfucker. Doesn't matter you were joking. He will kill you now.

"How many times do I have to SAY IT!? It isn't LEGALLY fucking if there's no PENETRATION!!!" He pulls out his machine gun. "AND I'M SO SICK AND FUCKING TIRED OF EVERYBODY INSINUATING I DID THAT TO MY MOTHER!!! MY MOTHER IS A FUCKING ANGEL OF DEATH AND NO ONE WILL TOUCH HER!!! EVER AGAIN!!! ESPECIALLY NOT AFTER WHAT HAPPENED TO ME!!!" He screams at you.