I'm going to step in here and defend the sedevacantists because my gripe is only with the dogmatic ones.
The issue is not that it is "not traditional". It is a legitimate theological opinion. And its not about "keeping it to themselves".
The issue is those who make it a dogma.
Such a silly response as yours is why so many of them turn dogmatic. You make them feel like they are ɧoɱosɛҳųαƖs or something.
Of course you are going to defend them - your own stance is not much different; a novel stance that claims it is more Catholic than any other Catholic. And yes it is novel. The Church does not teach and has never taught sedevacantism. So I repeat, it is a perceived theological opinion, not a real one. As a parish we have already had a gutful of Sede's trying to push their opinions on us as if they were dogmas. So, yes, it is about keeping their errors to themselves for the overall good of the parish. No one wants their children corrupted with this poison. What starts out as 'a discussion' always ends with Sedes trying to forcefully convert the faithful to their way of thinking and I have witnessed families break apart over this. This is because it is rooted in pride - "I know better". And it is the very same spirit that emulates from you - "Join the Resistance or you are not Catholic". I have all the time in the world for Catholics who are tempted with Sede-vacantism - it is hard to understand how our recent Popes can be doing what they are doing - but when you start down that road trying to make converts to your position as if it was an established truth, I will treat you like an active ɧoɱosɛҳųαƖ. The safety of our children demands it.