hi , i feel bad after my reaction to brother joke . now , he is angry against me . oh no that 's unfortunate , did you make fun of him or something ? i told him that he is stupid . i should n't have said that even something joke very bad oh , well sometimes we say things we do n't mean . if you apologize he 'll probably accept it and be fine again .
The cause of the guilty feeling is calling the brother "stupid" in reaction to his joke.