Canonically speaking, jc' reaction to someone he doesn't like/has strong negative feelings towards, because that person was a jerk to his sister, is to regulate his emotions according to how his sister feels. In a jyl lives au, after wwx's return, canon jc is going to his sister, saying something like: 'while I think we should throw at least a cup of tea at him because he left us you and a-ling like that, it's your choice, jin zixuan was your husband. What are we feeling now, jiejie?'