George Q. Cannon teaches that an honest difference of opinion with Church leaders does not constitute apostasy; however, if one publishes their criticisms and "to enforce them upon the people to produce division" is apostasy.
George Q. Cannon, Gospel Truth: Discourses and Writings of President Q. Cannon, ed. Jerreld L. Newquist, 2 vols. (Salt Lake City: Deseret Book, 1974), 2:276-77
OPPOSITION TO AUTHORITIES CAUSES APOSTASY. A friend . . . wished to know whether we . . . considered an honest difference of opinion between a member of the Church and the Authorities of the Church was apostasy. . . . We replied that we had not stated that an honest difference of opinion between a member of the Church and the Authorities constituted apostasy, for we could conceive of a man honestly differing in opinion from the Authorities of the Church and yet not be an apostate; but we could not conceive of a man publishing these differences of opinion and seeking by arguments, sophistry and special pleading to enforce them upon the people to produce division and strife and to place the acts and counsels of the Authorities of the Church, if possible, in a wrong light, and not be an apostate, for such conduct was apostasy as we understood the term.