If both churches consider themselves with infallible popes declaring gods will on earth, who is right? Do you see the dilemma? Neither can say that the other sect are true Catholics.
So if someone claims to be catholic but doesn't accept Pope Francis that doesn't make them not a catholic, it just means they don't think Pope Francis is the legitimate pope. They would consider him an antipope and his statements ex cathedra are therefore fallible since they aren't really statements ex cathedra in their minds.
How much you want to bet they’ll still be cool with a conservative business boycotting LGBT supporting businesses?