"They're just proud" is far more "convenient" (and far more insulting) than "They're just stupid."
An offense against the command "Judge not" is also involved.
I don't think that I have ever come across a sedevacantist who said, "They're just stupid." Ripping into arguments in favor of honoring the Vatican City leaders as Supreme Pontiffs and calling them stupid is another matter.
Only two or three times have I come across an adherent of the SSPX position who didn't accuse sedevacantists of the First Deadly Sin on the utterly self-centered basis of some outlandishly irrational home-grown analogy involving the sufferings of Jesus on Good Friday and everything but the kitchen sink.
"Say that thou art not Richard, who hath done all this," the lady says in the play when the royal scoundrel tries to doubletalk his way out of responsibility for his crimes.
Say that the top Vatican City leaders since 1958 have not said and done all the heretical and blasphemous and obscene and apostatical things that the harder-line Traditional Pope-recognizers and sedevacantists say they have said and done. Then say that there is nothing but nothing "on the Catholic books" which points Catholics in the direction of rejecting the heretical and blasphemous and obscene and apostatical putative pope as a true pope.
Sedevacantists want to prove that these putative popes are not popes. So what do they talk about? They talk about the errors and enormities of these putative popes, and attempt to demonstrate that true popes could not be guilty of them.
Their critics want to uphold these men as true popes. So what do they talk about? They talk about the real and imagined "sins" of past true popes and the alleged "Pride" of sedevacantists.
The sedevacantist is taking the trouble to analyze arguments iin favor of recognizing the Vatican II top leaders as Vicars iof Christ before he declares then stupid.
What is the Recognzing Resister analyzing before he declares the sedevacantist proud?
Just madcap analogies he concocted in his own head. "The Vatican II mess is the cross and the sedevacantist proudly walks away from the mess, which is walking away from the cross..."
Cardinal Schonborn of Vienna. Catechism Boy.
When a Vatican II church prelate shows unspeakably filthy pictures of Jesus Christ on the grounds of his cathedral, justifying his sacrilegious obscenity in the name of every last rubric of Modern Enlightenment in the Vatican II playbook, this is not "the cross" that we must love and embrace, filth and all. It's just a vile apostate doing his vile thing, performing a Satanistic ritual of profanation in accordance with the spirit and praxis of the vile religious cult to which he belongs: the Vatican II church. Or, "the Conciliar Church", as Archbishop Lefebvre DISMISSIVELY called it.
We're veering into the unhallowed and supremely sick domain of Sin Mysticism with all this equation of supreme iniquity with the means whereby Jesus of Nazareth, the King of the Jews was executed. This wild and unsound analogy concocting has to be strongly opposed.
Stupidity if NOT the eighth sacrament.
Intelligence is not a Mortal Sin.