If you hear any Catholic say or teach something that goes against the teaching and discipline of the Church, as safe-guarded by the Pope, politely, but firmly, challenge them, be they a lay catechist, teacher, deacon, priest or even a bishop.
He is in fact only reiterating Canon Law, which tells us this:
Can 212§3. According to the knowledge, competence, and prestige which they possess, they have the right and even at times the duty to manifest to the sacred pastors their opinion on matters which pertain to the good of the Church and to make their opinion known to the rest of the Christian faithful, without prejudice to the integrity of faith and morals, with reverence toward their pastors, and attentive to common advantage and the dignity of persons.
See Bishop O'Donaghue's full speech, from which the above passage is taken.