You are confusing "disagree" with "dismiss". I don't think they dismissed the concerns of their students, I think they disagreed with the students' proposed sol

You are confusing "disagree" with "dismiss". I don't think they dismissed the concerns of their students, I think they disagreed with the students' proposed solution and explained their reasoning. What kind of mentor would they be if they acquiesced to every demand a student makes, even when they believed it to be incorrect? Is not the purpose of having a mentor to learn from them, not to have them simply confirm everything you already want to believe?