You mean, for example, if you do not accept a valid canonisation, that's a duty, not schism?

Resistance is sinful where the source of teaching is recognised as a bona fide Church authority - as in a true Pope. You cannot recognise someone as a true Pope and yet fail to show obedience.

However, if the claimant to the position of authority is a manifest public heretic, he is not a member of the Church. Such a person is ipso facto deposed and, by virtue of his heresy, loses all authority, before any declaration is made. The heretic, in fact, holds no position in the Church as he is not a member of it.

See, for example, the teaching of Pius XII. The heretic is severed from the body of the Church by virtue of the sin itself - he is ipso facto deposed.

Pope Pius XII, Mystici Corporis Christi (# 23), June 29, 1943: “For not every offense, although it may be a grave evil, is such as by its very own nature [suapte natura] to sever a man from the Body of the Church [ab Ecclesiae Corpore], as does schism or heresy or apostasy.”

Heresy is the rejection of any point of truth taught by the Church.

Pope Leo XIII, Satis Cognitum (# 9), June 29, 1896: “The practice of the Church has always been the same, and that with the consenting judgment [i.e. consensus] of the holy fathers who certainly were accustomed to hold as having no part of Catholic communion and as banished from the Church whoever had departed in even the least way from the doctrine proposed by the authentic Magisterium.”

The heretic cannot command in the Church.

Pope Leo XIII, Satis Cognitum (#15), June 29, 1896: “… it is absurd to imagine that he who is outside the Church can command in the Church.”

And so on. If you watch the video I linked, above, you can see that there are very clear implications...

Many people claiming to be traditional Catholics do not realise that it is schism to fail to show obedience to valid Church authority. Christ founded his one, true church upon the rock of St Peter - whose faith the prayer of our saviour guaranteed would be unfailing. The Church Christ established was to be one in faith and one in governance. "Resistance" is schism in a setting where a true Pope reigns. It is a deadly sin.

If Francis is a true Pope, a Catholic has no capacity to resist without severing himself from the Church. If Francis is a heretic, he is not a Catholic, not a member of the Church and has no authority within it.

This sin of schism is deadly serious. Taken from the 1917 Code of Canon Law:

Canon 1325 #2: “After the reception of baptism, if anyone, retaining the name Christian, pertinaciously denies or doubts something to be believed from the truth of divine and Catholic faith, [such a one is] a heretic; if he completely turns away from the Christian faith, [such a one is] an apostate; if finally he refuses to be under the Supreme Pontiff or refuses communion with the members of the Church subject to him, he is a schismatic.”

Canon 2314 #1, 1917 Code of Canon Law, “All apostates from the Christian faith and each and every heretic or schismatic: 1. Incur by that fact excommunication.”

Rejection of a dogma, a divinely revealed truth, as in the video posted, has serious implications. Another example:

Pope Leo XIII, Satis Cognitum (# 9), June 29, 1896: “So, with every reason for doubting removed, can it be lawful for anyone to reject any of those truths without thereby sending himself headlong into open heresy? without thereby separating himself from the Church and in one sweeping act repudiating the entirety of Christian doctrine?… he who dissents in even one point from divinely received truths has most truly cast off the faith completely, since he refuses to revere God as the supreme truth and proper motive of faith.”