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They've certainly given us commands that we can't obey. 

Examples?

Just as the scribes and Pharisees ruled the Jews by technicalities and overbearing rules, so do our present day Modernists.  Thus we must be “wise as serpents” as Christ warned us.  So what really are we required to do, by law?

We have to accept V2 with “religious submission” (which is an invented term) and this means we have to assume it’s orthodox BUT we are allowed to question non-orthodox areas.  In reality, “religious submission” is a contradiction; hence it's meaningless.  
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The new mass is licit, in the sense that it exists.  It is NOT, however, obligatory to attend or to agree with.  Further, as Quo Primum shows, it is illegal to attend, as only the rite of St Pius V is both legal and obligatory. 
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It is not a sin to proselytize in any way.  

Stubborn made the ridiculous argument that the Conciliar Popes haven't commanded us to do anything.

I mean that's clearly ridiculous.  They've certainly given us commands that we can't obey.  They've also given us commands that some of us, at least, can obey in good conscience, while others perhaps can't.

Whether we're obliged to obey their *lawful* commands is gonna be a difference between R + R and Sede.

And I'm not convinced of the Sede view of the papacy itself, really that's my biggest issue with it.  I'm highly skeptical of ultramontanism.  While they were incorrect, I guess I'm not convinced the Conciliarists were *all* wrong (I agree with them being wrong where dogma condemns them.)  And I think from a realist standpoint its a bit silly to be all like "we have to obey the Pope no matter what.  Wait, we can't?  I guess he's not a true pope then."

But Stubborn did actually make this claim, and it doesn't make any sense.

Well, what constitutes a "lawful command" exactly, according to Church teaching? I can't remember Francis' exact wording about having to obey the U.N. Did he specifically say that all Catholics are now required to obey the U.N.? Is it now an official part of Church teaching that we are to obey the U.N?

The conciliar Popes have said and done things that go against the Catholic Faith for quite awhile now, whether or not it takes the form of telling us that we should do something, or saying something that goes against the Catholic Faith. It's nothing new. They are Modernists. They can't help it. We've been in the same boat for many decades now.

The sedes and sedeprivationists rarely talk about Modernism, when it comes the post-conciliar popes. They only care that these popes go against Church teaching, which makes them heretics. That's a difference between sedevacantism (and sedeprivationism) and R&R.

+ABL continually pointed to Modernism as being the cause of the Crisis. The SV's and SP's, while they do not deny that Modernism is a problem, don't really care much about the cause of the Crisis. They just continually harp on the Pope being a heretic and we can't follow him and that's that. End of story. That's why they act all shocked when Francis says something that goes against the Catholic Faith. They want everyone else to be shocked as well. Well, it doesn't work on me. There isn't anything that Francis can say or do that will shock me anymore. He's an extreme Modernist, and it better to have him as a true example of the ugliness of Modernism, than it would be to have another B16, who mixed a bit of tradition with his Modernism.