To be furious while preaching or teaching if one sees what one hates

Narrated Abu Musa: The Prophet (ﷺ) was asked about things which he did not like, but when the questioners insisted, the Prophet got angry. He then said to the people, "Ask me anything you like." A man asked, "Who is my father?" The Prophet (ﷺ) replied, "Your father is Hudhafa." Then another man got up and said, "Who is my father, O Allah's Messenger (ﷺ) ?" He replied, "Your father is Salim, Maula (the freed slave) of Shaiba." So when `Umar saw that (the anger) on the face of the Prophet (ﷺ) he said, "O Allah's Messenger (ﷺ)! We repent to Allah (Our offending you).