:jumping2:
The reason to reject BOD is related to the concept of invincible ignorance and salvation for those outside of the visible Church. BOD is simply the loophole the liberals use to allow the possibility of salvation for non- Catholics, irremediably causing indifferentism, which has been already condemned within the heresy of Modernism (Pius IX, syllabus of modern errors, 1864).
See, BOD adherents seek to prove that the sacrament of Baptism is not necessary for salvation and therefore, that there is salvation outside the church. They concede that sure, it is "better" to a visible member of the Church, but you can also be an invisible member and be saved. That is to say that Baptism is optional which is infallibly condemned. Because of this, the clever modernists twisted the concept of BOD, (originally speculated to catechumens only) so as not to remove completely the necessity of Baptism from the picture, but simply making it subjective, ambiguous, and ultimately invisible.
It is pretty obvious that revealed infallible dogmas are applicable for all time, not subjective to interpretation which contradict the obvious: that unless a man is a visible member of the visible Church on earth, subject in spiritual matters to the pope visible reigning, he is not in the path of salvation.