There are two hyperbolic sayings (questions) which demonstrate the problem with your position. 1) Are you more Catholic than the pope? 2) Is the pope Catholic?
Both of these “questions” have the same connotation as saying: “is grass green?” and “is water wet?”
A person who holds the sedevacantist position can still avail himself to the use of those two rhetorical questions.
Your bizarre notion about Catholicism turns those questions on their head because you truly believe that you are, in fact, more Catholic than the pope. An honest person will see the inherent problem with this.
The entire issue of being "more catholic than the Pope," is a doctrine of the sedevacantist religion, and just one of the many accusations that adherents of the sedevacantist religion lobby against non-sedevacantists, as if we do not have the right to question the words and actions of a Pope. The Pope is not God, though many sedevacantists believe that he is. That's another false doctrine of the sedevacantists - that the Pope is God, and therefore cannot do anything against the Catholic Faith, because God would not do anything against the Catholic Faith.
In fact, the Pope is mentioned far more often than Our Lord Jesus Christ, by the sedevacantists. Is the Pope more important, do you believe, than Jesus Christ? Are you aware that Jesus Christ is the actual head of the Catholic Church?