"How Can That Be?"
Even when he disagreed with someone, he never belittled them; he only asked how the opinion could be.
Dr. Abraham of Shaarei Zedek Hospital, who worked with Rav Shlomo Zalman on medical halachah, recalled that when the Rav disagreed with someone he never spoke of that person with contempt. He did not say that the other was foolish or mistaken. He would only wonder aloud, "Aich zeh yachol lihyot?", which asks how such a view could come to be. The question left the other person's dignity untouched and left the matter open for further thought. It reflected a habit of mind that his talmidim saw in the beis medrash as well, where he examined every view to its roots before saying that something seemed right to him. Shortly before his passing he gave a young relative this advice: to learn well, to eat and sleep well, and to keep smiling.
Source: Rav Hanoch Teller, And From Jerusalem His Word (Feldheim), a selection of which appeared in Jewish Action under the title "Gentle Giant"
The next time you hear an opinion you believe is wrong, whether from a colleague, a relative or a stranger online, replace your first reaction with a question in the spirit of how can that be. Ask it sincerely, and listen to the answer. Sometimes you will learn what you had missed, and sometimes you will disagree more clearly. Either way, the other person leaves with their dignity, and you leave with a calmer mind.