Pure ecumenism obligates a Catholic to tell the truth. Ecumenism without truth is false irenicism. This is teaching from the Second Vatican Council.
http://www.papalencyclicals.net/Leo13/l13curae.htm
We wish to direct our exhortation and our desires in a special way to those who are ministers of religion in their respective communities. They are men who from their very office take precedence in learning and authority, and who have at heart the glory of God and the salvation of souls. Let them be the first in joyfully submitting to the divine call and obey it, and furnish a glorious example to others. Assuredly, with an exceeding great joy, their Mother, the Church, will welcome them, and will cherish with all her love and care those whom the strength of their generous souls has, amidst many trials and difficulties, led back to her bosom. Nor could words express the recognition which this devoted courage will win for them from the assemblies of the brethren throughout the Catholic world, or what hope or confidence it will merit for them before Christ as their Judge, or what reward it will obtain from Him in the heavenly kingdom! And we, ourselves, in every lawful way, shall continue to promote their reconciliation with the Church in which individuals and masses, as we ardently desire, may find so much for their imitation. In the meantime, by the tender mercy of the Lord our God, we ask and beseech all to strive faithfully to follow in the path of divine grace and truth.
Then, considering that this matter, although already decided, had been by certain persons for whatever reason recalled into discussion, and that thence it might follow that a pernicious error would be fostered in the minds of many who might suppose that they possessed the Sacrament and effects of Orders, where these are nowise to be found, it seemed good to Us in the Lord to pronounce our judgment.
36. Wherefore, strictly adhering, in this matter, to the decrees of the pontiffs, our predecessors, and confirming them most fully, and, as it were, renewing them by our authority, of our own initiative and certain knowledge, we pronounce and declare that ordinations carried out according to the Anglican rite have been, and are, absolutely null and utterly void.
Nothing obligates a Catholic to be uncharitable, which is the only way that your initial comment can be described, your feigned remorse notwithstanding.