אין דור שאין בו ליצני' מה היו פריצי הדור עושין היו הולכי' אצל חלונותיו של דוד ואו' לו דוד אימת יבנה בית המקדש אימתי בית ה' נלךThere is no generation without scorners. What would the lawless of [King David's] generation do? They would go to David's windows and say, "David, when will the Beit haMikdash be built? When will we go to the house of Gd?"
This was a jibe with bite; King David longed to build the Beit haMikdash, and was told that he could not.[See Shemuel II 7, Melachim I 5, Divrei haYamim I 7 and 22 for more.]
But I like King David's response:
הו' או' אע"פ שמתכונין להכעיסני יבא עלי שאני שמח בלבי שמחתי באו' לי בית ה' נלךHe would respond, "Even though they intend to anger me, may I be rewarded for I am happy in my heart." [As Tehillim 122:1 says,] 'I am glad when they say to me, 'Let us go to the house of Gd.'
People mocked King David for various things - his lineage, his relationship with Batsheva, and, apparently, the Divine decree that he not construct the Beit haMikdash. But he took it in stride. A good lesson, I think, for today's leadership.