He doesn’t view derbies in the same way we do. Just like Ferguson never viewed City or Liverpool games the same way the fans did while he was United manager. Roy Keane has said before that Ferguson’s (and his own) big game was Arsenal and Wenger, not City or Liverpool. His aim was to “knock Liverpool off their perch” and he used Liverpool’s history of success to push United further in the media spotlight, but the big game for United in the 90s and 00s was Arsenal as Liverpool only challenged Ferguson for the title once.
Pep’s big game is Liverpool and Klopp, not United. Liverpool have been our main rivals in Pep’s reign as manager.