I don’t think it was a case of Jakob disrespecting Kerr, as it was instead, Jakob taking the sting out of the baited question. The question used the baiting word ‘revenge’, trying to play up a big revenge tour showdown.
But Jakob was simply indicating he didn’t have ‘revenge’ for Kerr in his heart. He would not be anticipating the next opportunity to ‘get him (specifically) back’. Jakob was simply saying when he is not at his best, or “falls down”, etc., then he is going to get beat, which does not then warrant him taking out revenge on who ever it is that wins that day.