Vatican I is telling you explicitly that you are bound to true obedience to the Sovereign Pontiff not only in matters of Faith and morals; but also in discipline and government.
Regardless of what you think a liturgical rite falls under: being a matter or Faith, of morals, of discipline, or government, you are required to obey the Pope, as per dogmatic teaching.
If an angel from heaven were to come down and preach lies, we are to let him be anathema - are we not? If the pope preaches lies, we are to let him be anathema - are we not? Sede's say they believe but really don't, that popes cannot preach lies - that is a lie they were taught and believe is a dogma, which only serves to prove they do not know what dogma even is.
God gave us the use of reason for a reason. We are expected to know what evil is no matter where it comes from so no, not "regardless of what you think", that is the point, we are expected to think, to know right from wrong - or we will NEVER make it to heaven.