Kamtza & Bar-Kamtza
The Talmudic story (Gittin 55b/56a) is well known. Because of a mix-up between two men of similar name was the Temple laid waste, according to the sages.
A host wanted Kamtza at his party but Bar-Kamtza mistakenly received the invitation and was pushed out in the sight of the whole assemblage.
The Talmud says that God himself supported Bar-Kamtza because He was shocked that one person could publicly embarrass another.
The rabbis say that a society in which people failed to respect one another did not deserve to survive (Yoma 9b).
